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Commitments and Contingencies - Commitments Narrative (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |
Maximum potential funding under commitments | $ 112,000,000 us-gaap_GuaranteeObligationsMaximumExposure | $ 98,000,000 us-gaap_GuaranteeObligationsMaximumExposure
Commitments to fund certain limited partnerships or subsidiaries [Member] |  |
Loss Contingencies [Line Items] |  |
Maximum potential funding under commitments | 14,000,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialGuaranteeMember | 34,000,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialGuaranteeMember
Commitments funded | $ 20,000,000 aon_PartnershipObligationsFunded / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialGuaranteeMember |

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- Definition Payments made to fund limited partnership interest and reduce related guaranteed commitment. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |