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Restructuring - Aon Hewitt Restructuring Plan Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 76,000,000 us-gaap_RestructuringReserve | $ 166,000,000 us-gaap_RestructuringReserve |
Payments for restructuring | 83,000,000 us-gaap_PaymentsForRestructuring |  |
Restructuring reserve translation adjustment | 7,000,000 us-gaap_RestructuringReserveTranslationAdjustment |  |
Aon Hewitt Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember | 174,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember | 98,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember
Risk Solutions [Member] | Aon Hewitt Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges |  | 94,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 32,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
HR Solutions [Member] | Aon Hewitt Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges |  | $ 80,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | $ 66,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = aon_AonHewittRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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