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    <link:label id="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1_terseLabel_en-US" xlink:label="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fiduciary Assets and Liabilities</link:label>
    <link:label id="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1_label_en-US" xlink:label="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fiduciary Assets and Liabilities [Abstract]</link:label>
    <link:label id="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1_documentation_en-US" xlink:label="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="aon-20191231.xsd#aon_FiduciaryAssetsAndLiabilitiesAbstract" xlink:label="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:to="lab_aon_FiduciaryAssetsAndLiabilitiesAbstract_2316EC0E182EFEC4909B321A162939A1" xlink:type="arc" />
    <link:label id="lab_aon_FiduciaryAssetsPremiumTrustBalances_42D34AA4D252ECFAE39F321A1629F826_terseLabel_en-US" xlink:label="lab_aon_FiduciaryAssetsPremiumTrustBalances_42D34AA4D252ECFAE39F321A1629F826" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Premium trust balances</link:label>
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    <link:label id="lab_aon_FiduciaryAssetsPremiumTrustBalances_42D34AA4D252ECFAE39F321A1629F826_documentation_en-US" xlink:label="lab_aon_FiduciaryAssetsPremiumTrustBalances_42D34AA4D252ECFAE39F321A1629F826" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents premium trust balances for premiums collected from insureds but not yet remitted to insurance companies.</link:label>
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    <link:label id="lab_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for Doubtful Accounts</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetAbstract_D27844859EF143FAE9C6321A162951DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, after Allowance for Credit Loss [Abstract]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed Assets</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_1F0F6EEEA3BF0317A63C321A16299093" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed assets, original life, weighted-average</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Useful Life</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_7BC26391EB9ED36FB5AE321A162AF23A" xlink:type="arc" />
    <link:label id="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6_terseLabel_en-US" xlink:label="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets</link:label>
    <link:label id="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6_label_en-US" xlink:label="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite Lived Intangible Asset [Abstract]</link:label>
    <link:label id="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6_documentation_en-US" xlink:label="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="aon-20191231.xsd#aon_FiniteLivedIntangibleAssetAbstract" xlink:label="loc_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:to="lab_aon_FiniteLivedIntangibleAssetAbstract_54C9B328D888D5210C44321A162AA9B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Useful life of finite-lived intangible assets</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Asset, Useful Life</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_96E5A8D834C0AFFB3880321A162A20CC" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:label="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:to="lab_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_744C6EB09C5418B756FC321A162AEE6D" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease right-of-use assets</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_2A158EB73C738053C7EA321A162A07EE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeaseLiability_981F1E3292C16EA7F2C2321A162B7ADE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_981F1E3292C16EA7F2C2321A162B7ADE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Present value of lease liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_981F1E3292C16EA7F2C2321A162B7ADE" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1CFA27926A28791B9EDE20724035D727" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanDerivativeMember_083EA129C10873BA151220C44ACAB634_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanDerivativeMember_083EA129C10873BA151220C44ACAB634" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivatives</link:label>
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    <link:label id="lab_aon_RealEstateAndRealEstateInvestmentTrustMember_CFDC7618FB5A8EEC22F720724035181C_verboseLabel_en-US" xlink:label="lab_aon_RealEstateAndRealEstateInvestmentTrustMember_CFDC7618FB5A8EEC22F720724035181C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Real estate</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_E5DB57B2361D40933F6225280D0F419E" xlink:to="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_E5DB57B2361D40933F6225280D0F419E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash impairment charge of disposition</link:label>
    <link:label id="lab_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1_label_en-US" xlink:label="lab_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_2AAA67087350493C750525280D107FB1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759" xlink:to="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_C906A8B57182C4F3C893F8D3270E1759" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in the net carrying amount of goodwill (in millions)</link:label>
    <link:label id="lab_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227_label_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:to="lab_us-gaap_GoodwillRollForward_85A499871C36711EEED7F8D3270FE227" xlink:type="arc" />
    <link:label id="lab_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51_periodStartLabel_en-US" xlink:label="lab_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at the beginning of the period</link:label>
    <link:label id="lab_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51_label_en-US" xlink:label="lab_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:to="lab_us-gaap_Goodwill_2C11E4C0D97CE791B183F8D3270FDB51" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill related to current year acquisitions</link:label>
    <link:label id="lab_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3_label_en-US" xlink:label="lab_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Acquired During Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:to="lab_us-gaap_GoodwillAcquiredDuringPeriod_2F1DF13C5AC6D90EC91AF8D3270F9FE3" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540_negatedLabel_en-US" xlink:label="lab_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Goodwill related to disposals</link:label>
    <link:label id="lab_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540_label_en-US" xlink:label="lab_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Written off Related to Sale of Business Unit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:to="lab_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_42A78AC4736DB182056CF8D3270FD540" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill related to prior year acquisitions</link:label>
    <link:label id="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0_label_en-US" xlink:label="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Purchase Accounting Adjustments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:to="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_857FE127BF32A4B920A4F8D3270FFFF0" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign currency translation</link:label>
    <link:label id="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C_label_en-US" xlink:label="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Foreign Currency Translation Gain (Loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:to="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_ACA7C6C12D2CEB96E0F0F8D32710C89C" xlink:type="arc" />
    <link:label id="lab_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213_periodEndLabel_en-US" xlink:label="lab_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at the end of the period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213" xlink:to="lab_us-gaap_Goodwill_A2C5962333244A5545E4F8D32710D213" xlink:type="arc" />
    <link:label id="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94_terseLabel_en-US" xlink:label="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of the Company's projected benefit obligation</link:label>
    <link:label id="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94_label_en-US" xlink:label="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Percentage of the Total Pension Obligations</link:label>
    <link:label id="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94_documentation_en-US" xlink:label="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of the company's total pension obligations represented within the tables provided.</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanPercentageOfTotalPensionObligations" xlink:label="loc_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:to="lab_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_AA27A8EEEDC96D5603011BD335818F94" xlink:type="arc" />
    <link:label id="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C_terseLabel_en-US" xlink:label="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Voluntary contribution</link:label>
    <link:label id="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C_label_en-US" xlink:label="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Estimated Employer Contributions for Current Fiscal Year At 35% Federal Tax Rate</link:label>
    <link:label id="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C_documentation_en-US" xlink:label="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Estimated Employer Contributions for Current Fiscal Year At 35% Federal Tax Rate</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate" xlink:label="loc_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:to="lab_aon_DefinedBenefitPlanEstimatedEmployerContributionsforCurrentFiscalYearAt35FederalTaxRate_FEA317D309529E3BBEDA1BD33581420C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plans with PBO in excess of plan assets, PBO</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:to="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_46BA70F79C0A810F30BA1BD335828C2B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plans with ABO in excess of the fair value of plan assets, ABO</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_37B2AFDFB07307958CD81BD33582A36B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_B6580CE95D1C836C55EB1B28E8631C28" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_FF81B9459BA5E7DB9EA41B28E863365A" xlink:type="locator" />
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    <link:label id="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661_terseLabel_en-US" xlink:label="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility Expiring February 2022</link:label>
    <link:label id="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661_label_en-US" xlink:label="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility Expiring February 2022 [Member]</link:label>
    <link:label id="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661_documentation_en-US" xlink:label="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Credit Facility Expiring February 2022 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_CreditFacilityExpiringFebruary2022Member" xlink:label="loc_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:to="lab_aon_CreditFacilityExpiringFebruary2022Member_2214876A72B9EC7949EB1B28E8636661" xlink:type="arc" />
    <link:label id="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F_terseLabel_en-US" xlink:label="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility Expiring October 2023</link:label>
    <link:label id="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F_label_en-US" xlink:label="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility Expiring October 2023 [Member]</link:label>
    <link:label id="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F_documentation_en-US" xlink:label="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Credit Facility Expiring October 2023 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_CreditFacilityExpiringOctober2023Member" xlink:label="loc_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:to="lab_aon_CreditFacilityExpiringOctober2023Member_B183E1995A6FF4C97CE11B28E864AD5F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:to="lab_us-gaap_LongtermDebtTypeAxis_40C2A1E09A8773639AEE1B28E864817A" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:to="lab_us-gaap_LongtermDebtTypeDomain_996D016D9170E731DA011B28E864E363" xlink:type="arc" />
    <link:label id="lab_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527_terseLabel_en-US" xlink:label="lab_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Notes</link:label>
    <link:label id="lab_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527_label_en-US" xlink:label="lab_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:to="lab_us-gaap_SeniorNotesMember_0E97D6171D554C78CBE51B28E8659527" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit</link:label>
    <link:label id="lab_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB_label_en-US" xlink:label="lab_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:to="lab_us-gaap_LineOfCreditMember_821EF6AC9F4BE257D0211B28E86535EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:to="lab_us-gaap_DebtInstrumentAxis_E5AD9514F0F1D22A6F931B28E8665788" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:to="lab_us-gaap_DebtInstrumentNameDomain_1E48B5D1308F082DAC751B28E866FDD5" xlink:type="arc" />
    <link:label id="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0_terseLabel_en-US" xlink:label="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.20% Senior Notes due November 2022</link:label>
    <link:label id="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0_label_en-US" xlink:label="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2.20% Senior Notes due November 2022 [Member]</link:label>
    <link:label id="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0_documentation_en-US" xlink:label="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2.20% Senior Notes due November 2022 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A2.20SeniorNotesdueNovember2022Member" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:to="lab_aon_A2.20SeniorNotesdueNovember2022Member_199840A6555939D01ED11B28E86740B0" xlink:type="arc" />
    <link:label id="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128_terseLabel_en-US" xlink:label="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.00% Senior Notes due September 2020</link:label>
    <link:label id="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128_label_en-US" xlink:label="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">5.00% Senior Notes Due September 2020 [Member]</link:label>
    <link:label id="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128_documentation_en-US" xlink:label="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the senior notes that bear an interest rate of 5.00 percent and will mature in 2020.</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A5.00SeniorNotesDueSeptember2020Member" xlink:label="loc_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:to="lab_aon_A5.00SeniorNotesDueSeptember2020Member_4CB4D24D09EC0202F3601B28E867E128" xlink:type="arc" />
    <link:label id="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8_terseLabel_en-US" xlink:label="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.75% Senior Notes due May 2029</link:label>
    <link:label id="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8_label_en-US" xlink:label="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">3.75% Senior Notes Due May 2, 2029 [Member]</link:label>
    <link:label id="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8_documentation_en-US" xlink:label="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">3.75% Senior Notes Due May 2, 2029 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A3.75SeniorNotesDueMay22029Member" xlink:label="loc_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:to="lab_aon_A3.75SeniorNotesDueMay22029Member_E881BE6671175A0039FF1B28E86794C8" xlink:type="arc" />
    <link:label id="lab_aon_A4.50SeniorNotesDueDecember2028Member_CA2E25FE80EC019BA2101B28E86722A6_terseLabel_en-US" xlink:label="lab_aon_A4.50SeniorNotesDueDecember2028Member_CA2E25FE80EC019BA2101B28E86722A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.50% Senior Notes due December 2028</link:label>
    <link:label id="lab_aon_A4.50SeniorNotesDueDecember2028Member_CA2E25FE80EC019BA2101B28E86722A6_label_en-US" xlink:label="lab_aon_A4.50SeniorNotesDueDecember2028Member_CA2E25FE80EC019BA2101B28E86722A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.50% Senior Notes Due December 2028 [Member]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_6CD68F074F13ABBDE08D2030B7921B39_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_6CD68F074F13ABBDE08D2030B7921B39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_B552070BE99C8636D5372030B7930132" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_C4E1C27911124052B9183A83D707EDD1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_C4E1C27911124052B9183A83D707EDD1" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_C4E1C27911124052B9183A83D707EDD1" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2024</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_22E0A8C8BBDA6D1CB9A03A83D707AF01" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payments, Due after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_74D7C4997B30A3BF47103A83D707F374" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C_totalLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Less: Imputed interest</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Payment, Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_688BB95AF4AA03118FE13A83D707532C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Less: Imputed interest</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:to="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_5266DDB354322EC1481A3A83D707ED0F" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Present value of lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:to="lab_us-gaap_FinanceLeaseLiability_C19100CDA5E17E0E01EE3A83D7087515" xlink:type="arc" />
    <link:label id="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA_terseLabel_en-US" xlink:label="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA_label_en-US" xlink:label="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases Maturity [Abstract]</link:label>
    <link:label id="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA_documentation_en-US" xlink:label="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leases Maturity [Abstract]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_LeasesMaturityAbstract" xlink:label="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:to="lab_aon_LeasesMaturityAbstract_74807B4C653AFBE981333A83D708CEAA" xlink:type="arc" />
    <link:label id="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5_totalLabel_en-US" xlink:label="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5_label_en-US" xlink:label="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance And Operating Lease Liability, Payments, Net Of Sublease Income, Remainder Of Fiscal Year</link:label>
    <link:label id="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5_documentation_en-US" xlink:label="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Remainder Of Fiscal Year</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear" xlink:label="loc_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:to="lab_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeRemainderOfFiscalYear_00E76F34510245FEAADD3A83D7086AD5" xlink:type="arc" />
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D_totalLabel_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D_label_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Two</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D_documentation_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Two</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:to="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_479EC976D45BD55A1D4E3A83D708017D" xlink:type="arc" />
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C_totalLabel_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C_label_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Three</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C_documentation_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Three</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:to="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_08756A04C9FC9A96D1613A83D7087D6C" xlink:type="arc" />
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681_totalLabel_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681_label_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Four</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681_documentation_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Four</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:to="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_E92E22B3CEC32A5D774D3A83D7089681" xlink:type="arc" />
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08_totalLabel_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2024</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08_label_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Five</link:label>
    <link:label id="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08_documentation_en-US" xlink:label="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing And Operating Lease Liability, Payments, Net Of Sublease Income, Due Year Five</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:to="lab_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_82395A359A218CB7EBFF3A83D7093D08" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_7AD800F5F1AFDA316FE11550F3A583B7" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_7AD800F5F1AFDA316FE11550F3A583B7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative term of contract (in days)</link:label>
    <link:label id="lab_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E_label_en-US" xlink:label="lab_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Term of Contract</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTermOfContract" xlink:label="loc_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:to="lab_us-gaap_DerivativeTermOfContract_FA1A6BD9594045F1C5501550F3A5859E" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Claims, Lawsuits, and Other Contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1321B149A666CF58A5FBD74868450151" xlink:type="arc" />
    <link:label id="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24_terseLabel_en-US" xlink:label="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.80% Senior Notes due March 2021</link:label>
    <link:label id="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24_label_en-US" xlink:label="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Point Eight Zero Percent Senior Notes Due Twenty Twenty One [Member]</link:label>
    <link:label id="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24_documentation_en-US" xlink:label="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Point Eight Zero Percent Senior Notes Due Twenty Twenty One [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember" xlink:label="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:to="lab_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_E3954C545C5D0D127B801BD336C42D24" xlink:type="arc" />
    <link:label id="lab_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26_verboseLabel_en-US" xlink:label="lab_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2.20% Senior Notes due November 2022</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A2.20SeniorNotesdueNovember2022Member" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26" xlink:to="lab_aon_A2.20SeniorNotesdueNovember2022Member_6AEFBBC927CEFA53F9FA1BD336C41B26" xlink:type="arc" />
    <link:label id="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360_terseLabel_en-US" xlink:label="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.00% Senior Notes due November 2023</link:label>
    <link:label id="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360_label_en-US" xlink:label="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.00% Senior Notes Due November 2023 [Member]</link:label>
    <link:label id="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360_documentation_en-US" xlink:label="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.00% Senior Notes Due November 2023  [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A4.00SeniorNotesDueNovember2023Member" xlink:label="loc_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:to="lab_aon_A4.00SeniorNotesDueNovember2023Member_5CA0B5C5133F4ACF73341BD336C55360" xlink:type="arc" />
    <link:label id="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F_terseLabel_en-US" xlink:label="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.50% Senior Notes due June 2024</link:label>
    <link:label id="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F_label_en-US" xlink:label="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">3.50% Notes due June 2024 [Member]</link:label>
    <link:label id="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F_documentation_en-US" xlink:label="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">3.50% Notes due June 2024 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A3.50NotesdueJune2024Member" xlink:label="loc_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:to="lab_aon_A3.50NotesdueJune2024Member_18733E51EF2BEB1DE4AC1BD336C5138F" xlink:type="arc" />
    <link:label id="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970_terseLabel_en-US" xlink:label="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.875% Senior Notes due December 2025</link:label>
    <link:label id="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970_label_en-US" xlink:label="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">3.875% Senior Notes due December 2025 [Member]</link:label>
    <link:label id="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970_documentation_en-US" xlink:label="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">3.875% Senior Notes due December 2025 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A3.875SeniorNotesdueDecember2025Member" xlink:label="loc_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:to="lab_aon_A3.875SeniorNotesdueDecember2025Member_4358E65EF07DE0B8F7351BD336C50970" xlink:type="arc" />
    <link:label id="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0_terseLabel_en-US" xlink:label="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.875% Senior Notes due May 2026 (EUR 500M)</link:label>
    <link:label id="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0_label_en-US" xlink:label="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">2.875% notes due 2026 [Member]</link:label>
    <link:label id="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0_documentation_en-US" xlink:label="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">2.875% notes due 2026 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_A2.875notesdue2026Member" xlink:label="loc_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:to="lab_aon_A2.875notesdue2026Member_BF8A6591288439C10AFF1BD336C544B0" xlink:type="arc" />
    <link:label id="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5_terseLabel_en-US" xlink:label="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">8.205% Junior Subordinated Notes due January 2027</link:label>
    <link:label id="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5_label_en-US" xlink:label="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Junior Subordinated Deferrable Interest Debentures 8.205 Percent Due 2027 [Member]</link:label>
    <link:label id="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5_documentation_en-US" xlink:label="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the junior subordinated deferrable interest debentures that bear an interest rate of 8.205 percent and will mature in 2027.</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member" xlink:label="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:to="lab_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_39F5DBFFE01DBE512AB01BD336C5AAA5" xlink:type="arc" />
    <link:label id="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A_terseLabel_en-US" xlink:label="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.25% Senior Notes due September 2040</link:label>
    <link:label id="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A_label_en-US" xlink:label="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes 6.25 Percent, Due 2040 [Member]</link:label>
    <link:label id="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A_documentation_en-US" xlink:label="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the senior notes that bear an interest rate of 6.25 percent and will mature in 2040.</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_SeniorNotes625PercentDue2040Member" xlink:label="loc_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:to="lab_aon_SeniorNotes625PercentDue2040Member_40E443C23014AE79AF991BD336C6756A" xlink:type="arc" />
    <link:label id="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B_terseLabel_en-US" xlink:label="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.25% Senior Notes due December 2042</link:label>
    <link:label id="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B_label_en-US" xlink:label="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes 4.25 Percent Due 2042 [Member]</link:label>
    <link:label id="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B_documentation_en-US" xlink:label="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the senior notes that bear an interest rate of 4.25 percent and will mature in 2042.</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_SeniorNotes4.25PercentDue2042Member" xlink:label="loc_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:to="lab_aon_SeniorNotes4.25PercentDue2042Member_BF603060658CF6B6D43D1BD336C6F89B" xlink:type="arc" />
    <link:label id="lab_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A_terseLabel_en-US" xlink:label="lab_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.45% Senior Notes due May 2043</link:label>
    <link:label id="lab_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A_label_en-US" xlink:label="lab_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Due at 2043 at 4.45 Percent [Member]</link:label>
    <link:label id="lab_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A_documentation_en-US" xlink:label="lab_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Notes Due at 2043 at 4.45 Percent [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_NotesDueat2043at4.45PercentMember" xlink:label="loc_aon_NotesDueat2043at4.45PercentMember_9DD0D19F7C40C6C77BAC1BD336C6910A" xlink:type="locator" />
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    <link:label id="lab_aon_A4.60SeniorNotesDueJune2044Member_47DB7A236D4805BCFDC71BD336C7CA00_terseLabel_en-US" xlink:label="lab_aon_A4.60SeniorNotesDueJune2044Member_47DB7A236D4805BCFDC71BD336C7CA00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.60% Senior Notes due June 2044</link:label>
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    <link:label id="lab_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_40DC806A597F8FF3A14BDC57B403D1DE_terseLabel_en-US" xlink:label="lab_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_40DC806A597F8FF3A14BDC57B403D1DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Money market funds</link:label>
    <link:label id="lab_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_40DC806A597F8FF3A14BDC57B403D1DE_label_en-US" xlink:label="lab_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_40DC806A597F8FF3A14BDC57B403D1DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Money Market Funds and Other Highly Liquid Debt Securities [Member]</link:label>
    <link:label id="lab_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_40DC806A597F8FF3A14BDC57B403D1DE_documentation_en-US" xlink:label="lab_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_40DC806A597F8FF3A14BDC57B403D1DE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the money market funds and other highly liquid securities owned by the entity.</link:label>
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    <link:label id="lab_aon_GovernmentBondSecuritiesMember_B1692D670B477609C015DC57B403B4C6_terseLabel_en-US" xlink:label="lab_aon_GovernmentBondSecuritiesMember_B1692D670B477609C015DC57B403B4C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Government bonds</link:label>
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    <link:label id="lab_aon_GovernmentBondSecuritiesMember_B1692D670B477609C015DC57B403B4C6_documentation_en-US" xlink:label="lab_aon_GovernmentBondSecuritiesMember_B1692D670B477609C015DC57B403B4C6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This category includes information about long-term debt securities that are issued by either a domestic or foreign government business entity with a date certain promise of repayment and a return to the holder for the time value of money.</link:label>
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    <link:label id="lab_us-gaap_EquitySecuritiesMember_3121E9306D1475D2F4E2DC57B40367E9_verboseLabel_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember_3121E9306D1475D2F4E2DC57B40367E9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Equity investments</link:label>
    <link:label id="lab_us-gaap_EquitySecuritiesMember_3121E9306D1475D2F4E2DC57B40367E9_label_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember_3121E9306D1475D2F4E2DC57B40367E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Securities [Member]</link:label>
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    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_D3BD787FEAB6C15F7864DC5766114331_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis_D3BD787FEAB6C15F7864DC5766114331" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_D3BD787FEAB6C15F7864DC5766114331" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_D061AEB4E29FCBCA0287DC5766110CAF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recurring</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Recurring [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1FDCC42972ADD025F086DC576612D1BB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of assets and liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_08638971F8D784133C77DC5766126FB0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB_label_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Fair Value Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:to="lab_us-gaap_AssetsFairValueDisclosureAbstract_A774A9F161CB661F5C00DC5766122AAB" xlink:type="arc" />
    <link:label id="lab_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244_terseLabel_en-US" xlink:label="lab_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Money market funds</link:label>
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    <link:label id="lab_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244_documentation_en-US" xlink:label="lab_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the fair value of money market funds and other highly liquid securities.</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure" xlink:label="loc_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:to="lab_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_75D84BF9E99A5752F446DC5766124244" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48_terseLabel_en-US" xlink:label="lab_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other investments</link:label>
    <link:label id="lab_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48_label_en-US" xlink:label="lab_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherInvestments" xlink:label="loc_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:to="lab_us-gaap_OtherInvestments_1412F34FAD60608ABC55DC576613AE48" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross foreign exchange contracts</link:label>
    <link:label id="lab_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064_label_en-US" xlink:label="lab_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:to="lab_us-gaap_DerivativeAssets_EF8AAB882703FF785884DC5766135064" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E_label_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_262AABFBE9D19418B5B2DC576613C45E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Fair Value Disclosure [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilities_CCE299FE834482D36D89DC576613ADA6_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities_CCE299FE834482D36D89DC576613ADA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross foreign exchange contracts</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilities_CCE299FE834482D36D89DC576613ADA6_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities_CCE299FE834482D36D89DC576613ADA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_DF1C51D51309ED4EC3CB2A57DF9D2E9C_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_DF1C51D51309ED4EC3CB2A57DF9D2E9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity securities</link:label>
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    <link:label id="lab_us-gaap_PerformanceSharesMember_6CAD597242F0C314C67220723FDD433E_terseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_6CAD597242F0C314C67220723FDD433E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance-based Awards</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BA54F27DFC782836E05220723FDE8AB5_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BA54F27DFC782836E05220723FDE8AB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Target PSAs granted (in shares)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BA54F27DFC782836E05220723FDE8AB5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5D8DBC89862DCD6A69F320723FDE251B_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5D8DBC89862DCD6A69F320723FDE251B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fair value (in dollars per share)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5D8DBC89862DCD6A69F320723FDE251B" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5D8DBC89862DCD6A69F320723FDE251B" xlink:type="arc" />
    <link:label id="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_BD9E741D7C53040C481420723FDE373A_terseLabel_en-US" xlink:label="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_BD9E741D7C53040C481420723FDE373A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares that would be issued based on current performance levels (in shares)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_BD9E741D7C53040C481420723FDE373A" xlink:to="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_BD9E741D7C53040C481420723FDE373A" xlink:type="arc" />
    <link:label id="lab_aon_UnamortizedExpenseOnPerformanceBasedPlans_9CF50E99DF206A0B015E20723FDE6B9E_terseLabel_en-US" xlink:label="lab_aon_UnamortizedExpenseOnPerformanceBasedPlans_9CF50E99DF206A0B015E20723FDE6B9E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unamortized expense, based on current performance levels</link:label>
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    <link:label id="lab_aon_UnamortizedExpenseOnPerformanceBasedPlans_9CF50E99DF206A0B015E20723FDE6B9E_documentation_en-US" xlink:label="lab_aon_UnamortizedExpenseOnPerformanceBasedPlans_9CF50E99DF206A0B015E20723FDE6B9E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents unamortized expense of performance-based stock award plans, based on current performance levels.</link:label>
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    <link:label id="lab_us-gaap_OperatingLeaseCost_233099265D084097658EFC2F7B6290CB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_233099265D084097658EFC2F7B6290CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease cost</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_233099265D084097658EFC2F7B6290CB" xlink:type="locator" />
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    <link:label id="lab_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3_terseLabel_en-US" xlink:label="lab_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease costs</link:label>
    <link:label id="lab_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3_label_en-US" xlink:label="lab_aon_FinanceLeaseCost1Abstract_120EAC400B1F85AC8919FC2F7B6267B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Cost1 [Abstract]</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_E83BA2CFBB4BA9653F3EFC2F7B625D0F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_E83BA2CFBB4BA9653F3EFC2F7B625D0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of leased assets</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest on lease liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Interest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_66E410EC129AA3C75722FC2F7B624A03" xlink:type="locator" />
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    <link:label id="lab_us-gaap_VariableLeaseCost_0D4D3F1F6558BA501069FC2F7B62E66C_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_0D4D3F1F6558BA501069FC2F7B62E66C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Lease, Cost</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableLeaseCost_0D4D3F1F6558BA501069FC2F7B62E66C" xlink:to="lab_us-gaap_VariableLeaseCost_0D4D3F1F6558BA501069FC2F7B62E66C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShortTermLeaseCost_D5A51D0B698CC00EA323FC2F7B63A721_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_D5A51D0B698CC00EA323FC2F7B63A721" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term lease cost</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShortTermLeaseCost_D5A51D0B698CC00EA323FC2F7B63A721" xlink:to="lab_us-gaap_ShortTermLeaseCost_D5A51D0B698CC00EA323FC2F7B63A721" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Sublease income</link:label>
    <link:label id="lab_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823_label_en-US" xlink:label="lab_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sublease Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_58004ADA4BD93BACA466FC2F7B638823" xlink:type="locator" />
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    <link:label id="lab_aon_ShareRepurchaseProgramof2014Member_BAF3E630BF50DFAC8DD2D7486D10FCE4_terseLabel_en-US" xlink:label="lab_aon_ShareRepurchaseProgramof2014Member_BAF3E630BF50DFAC8DD2D7486D10FCE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share Repurchase Program of 2014</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_4D67470CA46CCBF42BBF2032544E649B_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_4D67470CA46CCBF42BBF2032544E649B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale of businesses, net of cash sold</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D6B5AA40B7E17FEB07F92032544EFCDC_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D6B5AA40B7E17FEB07F92032544EFCDC" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_B9CFADAEE33B27991C0F2032544F2B0D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C3527F89FC514EB1A96B2032544F2061" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expected future benefit payments 2022</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_333ABFDFE18C9605561D20B17B6B69E3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expected future benefit payments 2023</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_25F73554DCBD6D860B2020B17B6BA8B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expected future benefit payments 2024</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_06162C66FF6E318CCF4F20B17B6BD7C9" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expected future benefit payments 2025-2029</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_54AC92CB7D0324B0F86F20B17B6CB4CF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_FB42896832955928AED320B17B6C6258_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_FB42896832955928AED320B17B6C6258" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation_FB42896832955928AED320B17B6C6258" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of one percentage point decrease on accumulated postretirement benefit obligation</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:to="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1_7E5A2D5102E64C6520CF20B17B6C2534" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of one percentage point increase on service cost and interest cost components of net periodic benefit cost</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3" xlink:to="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents_F3DC66BBAFBFB891C65E20B17B6C75A3" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of one percentage point decrease on service cost and interest cost components of net periodic benefit cost</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA" xlink:to="lab_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1_1C244CACA08CDC7552D420B17B6CFECA" xlink:type="arc" />
    <link:label id="lab_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886_terseLabel_en-US" xlink:label="lab_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum percentage of liability for future plan cost increases for pre-65 and medical supplement plan coverage</link:label>
    <link:label id="lab_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886_label_en-US" xlink:label="lab_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan Percentage of Medical Supplement Plan</link:label>
    <link:label id="lab_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886_documentation_en-US" xlink:label="lab_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_47CCF5CAD5CEEE24DFB920B17B6DC886" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of medical supplement plan coverage for defined benefit plan.</link:label>
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    <link:label id="lab_aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods_585B8707F5206A02D2B220B17B6DC0D9_terseLabel_en-US" xlink:label="lab_aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods_585B8707F5206A02D2B220B17B6DC0D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum percentage of medical supplement plan into future periods</link:label>
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    <link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_044B9A20DAB70AE97F84D7486854B2A6_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_044B9A20DAB70AE97F84D7486854B2A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements and Financial Instruments</link:label>
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    <link:label id="lab_us-gaap_RestructuringReserveTranslationAdjustment_E526C2C3FE0C8444E3DC2A57E2C8B0C6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveTranslationAdjustment_E526C2C3FE0C8444E3DC2A57E2C8B0C6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Foreign currency translation and other</link:label>
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    <link:label id="lab_aon_LeadershipPerformancePlanCycle20142016Member_A81099A53BF59B34100B20723FE31457_label_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20142016Member_A81099A53BF59B34100B20723FE31457" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2014-2016 [Member]</link:label>
    <link:label id="lab_aon_LeadershipPerformancePlanCycle20142016Member_A81099A53BF59B34100B20723FE31457_documentation_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20142016Member_A81099A53BF59B34100B20723FE31457" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2014-2016 [Member]</link:label>
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    <link:label id="lab_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0_label_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2013-2015 [Member]</link:label>
    <link:label id="lab_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0_documentation_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2013-2015 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_LeadershipPerformancePlanCycle20132015Member" xlink:label="loc_aon_LeadershipPerformancePlanCycle20132015Member_2B551211586307CC521420723FE322F0" xlink:type="locator" />
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    <link:label id="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D_terseLabel_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2012-2014</link:label>
    <link:label id="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D_label_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2012-2014 [Member]</link:label>
    <link:label id="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D_documentation_en-US" xlink:label="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leadership Performance Plan Cycle 2012-2014 [Member]</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_LeadershipPerformancePlanCycle20122014Member" xlink:label="loc_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:to="lab_aon_LeadershipPerformancePlanCycle20122014Member_AAB858A6E059DC16358420723FE33E1D" xlink:type="arc" />
    <link:label id="lab_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5_terseLabel_en-US" xlink:label="lab_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSA, vesting conditions period (in years)</link:label>
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    <link:label id="lab_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5_documentation_en-US" xlink:label="lab_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Vesting Conditions Period</link:label>
    <link:loc xlink:href="aon-20191231.xsd#aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod" xlink:label="loc_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_6986A4CB968729B7CD1B20723FE5E6A5" xlink:type="locator" />
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    <link:label id="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_A50899BD2BE4750A4B1420723FE6D770_terseLabel_en-US" xlink:label="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_A50899BD2BE4750A4B1420723FE6D770" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSA, actual shares issued, percent</link:label>
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    <link:label id="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_A50899BD2BE4750A4B1420723FE6D770_documentation_en-US" xlink:label="lab_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_A50899BD2BE4750A4B1420723FE6D770" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued, Percent</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_823B606EF8529737500F20723FE6AF04_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_823B606EF8529737500F20723FE6AF04" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Shares issued (in shares)</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_6DD60A30AE386CDFE5F22030B0F7D128" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Condensed Consolidating Statement of Income</link:label>
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    <link:label id="lab_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201_terseLabel_en-US" xlink:label="lab_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intercompany interest income (expense)</link:label>
    <link:label id="lab_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201_label_en-US" xlink:label="lab_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intercompany Interest Expense Income</link:label>
    <link:label id="lab_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201_documentation_en-US" xlink:label="lab_aon_IntercompanyInterestExpenseIncome_672C00D0A7445DDEE2742030B0FA9201" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the intercompany interest income and interest expense.</link:label>
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    <link:label id="lab_aon_IntercompanyOtherIncomeExpenseNet_EA3BDBD3044C9064E0032030B0FBB6C5_terseLabel_en-US" xlink:label="lab_aon_IntercompanyOtherIncomeExpenseNet_EA3BDBD3044C9064E0032030B0FBB6C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intercompany other income (expense)</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_C05DEA120D470B625D192030B0FBE315_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_C05DEA120D470B625D192030B0FBE315" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income tax expense (benefit)</link:label>
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    <link:label id="lab_aon_IncomeLossBeforeEquityEarningsOfSubsidiaries_365BF4DEF5FBB6FF894B2030B0FCE8AD_terseLabel_en-US" xlink:label="lab_aon_IncomeLossBeforeEquityEarningsOfSubsidiaries_365BF4DEF5FBB6FF894B2030B0FCE8AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss) before equity in earnings of subsidiaries</link:label>
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    <link:label id="lab_aon_IncomeLossBeforeEquityEarningsOfSubsidiaries_365BF4DEF5FBB6FF894B2030B0FCE8AD_documentation_en-US" xlink:label="lab_aon_IncomeLossBeforeEquityEarningsOfSubsidiaries_365BF4DEF5FBB6FF894B2030B0FCE8AD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Income (Loss) Before Equity Earnings Of Subsidiaries</link:label>
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    <link:label id="lab_aon_EquityEarningsFromSubsidiaries_A49EE3D13063BA6265F62030B0FC8C4F_terseLabel_en-US" xlink:label="lab_aon_EquityEarningsFromSubsidiaries_A49EE3D13063BA6265F62030B0FC8C4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity in earnings of subsidiaries</link:label>
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    <link:label id="lab_aon_ChristchurchCityCouncilMember_2B3F2CA73B2360A1E7D4FC243F15F106_terseLabel_en-US" xlink:label="lab_aon_ChristchurchCityCouncilMember_2B3F2CA73B2360A1E7D4FC243F15F106" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Christchurch City Council</link:label>
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    <link:label id="lab_aon_ChristchurchCityCouncilMember_2B3F2CA73B2360A1E7D4FC243F15F106_documentation_en-US" xlink:label="lab_aon_ChristchurchCityCouncilMember_2B3F2CA73B2360A1E7D4FC243F15F106" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Christchurch City Council [Member]</link:label>
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    <link:label id="lab_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E_terseLabel_en-US" xlink:label="lab_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pilkington North America, Inc.</link:label>
    <link:label id="lab_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E_label_en-US" xlink:label="lab_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pilkington North America, Inc. [Member]</link:label>
    <link:label id="lab_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E_documentation_en-US" xlink:label="lab_aon_PilkingtonNorthAmericaInc.Member_90A7C51D354DAAA21692FC243F152E5E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pilkington North America, Inc. [Member]</link:label>
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    <link:label id="lab_us-gaap_LossContingencyEstimateOfPossibleLoss_605F0351BA6F521AAB89FC243F158A6C_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyEstimateOfPossibleLoss_605F0351BA6F521AAB89FC243F158A6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimate of possible loss</link:label>
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    <link:label id="lab_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Value of damages sought</link:label>
    <link:label id="lab_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31_label_en-US" xlink:label="lab_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Damages Sought, Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_7D88739E6031DC13CAC7FC243F167C31" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingencyDamagesAwardedValue_DC5E21F4004BC321A6BFFC243F1693DA_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyDamagesAwardedValue_DC5E21F4004BC321A6BFFC243F1693DA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Damages awarded</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyDamagesAwardedValue" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_DC5E21F4004BC321A6BFFC243F1693DA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total revenue</link:label>
    <link:label id="lab_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD_label_en-US" xlink:label="lab_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_B35228913DEA28E55DBCFC243F1671DD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of assets and liabilities that are measured at fair value on a recurring basis</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_547C16D0A3A03D7C1D7CD74869BC86A4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of financial instruments where the carrying amounts and fair values differ</link:label>
    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69_label_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTextBlock" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTextBlock_5623C56E5EDDB05D41E3D74869BD5C69" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred revenue</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:to="lab_us-gaap_ContractWithCustomerLiabilityCurrent_6DAB5DE9E7675113C82B12266EC7A775" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Taxes payable</link:label>
    <link:label id="lab_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1_label_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Income Taxes, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_707669629CC68533652A12266EC72EE1" xlink:type="locator" />
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    <link:label id="lab_aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent_F87C3E3CB4AB8D2F702B12266EC78201_terseLabel_en-US" xlink:label="lab_aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent_F87C3E3CB4AB8D2F702B12266EC78201" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
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    <link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_7C6380FA803C86AD0E2412266EC7CEEF_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_7C6380FA803C86AD0E2412266EC7CEEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_C5679CD77EFE40A1FBA912266EC8BA1C_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_C5679CD77EFE40A1FBA912266EC8BA1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred revenue recognized</link:label>
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    <link:label id="lab_aon_EquityDerivativeMember_0907FE367C9CF642D1A62A57DFCC6AFB_terseLabel_en-US" xlink:label="lab_aon_EquityDerivativeMember_0907FE367C9CF642D1A62A57DFCC6AFB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity derivatives</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInRestructuringReserve" xlink:label="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_B2FF6B1BEA4C652027D720803183E384" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B643BC9BC79549EF3D702080318338DB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pension, other postretirement and postemployment liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF" xlink:to="lab_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_68D7775381CFAAFA8F292080318464BF" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_491DA20692A6E4327BC8208031847CE4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_BE6B15BAA1DDFCCAFE4320803184B4D8_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_BE6B15BAA1DDFCCAFE4320803184B4D8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Cash provided by operating activities - continuing operations</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_CE9E434C0DD36D02AAD22080318A0A37_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_CE9E434C0DD36D02AAD22080318A0A37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest paid</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_889D32DB1442CF3008172080318B95C1_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_889D32DB1442CF3008172080318B95C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes paid, net of refunds</link:label>
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