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Commitments and Contingencies - Legal Narrative (Details) |  |  | 1 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 Potential Claim for Pension Advisory Services [Member] USD ($) | Apr. 30, 2014 Potential Claim for Pension Advisory Services [Member] GBP (£) | May 31, 2010 Opry Mills Mall Limited Partnership [Member] USD ($) | Dec. 12, 2012 Mazeikiu Nafta [Member] USD ($) | Dec. 02, 2014 International Road Transport Union [Member] Litigation Foreign Currency Denominated Award [Member] USD ($) | Dec. 02, 2014 International Road Transport Union [Member] Litigation Foreign Currency Denominated Award [Member] CHF | Jun. 01, 2007 International Road Transport Union [Member] Litigation Foreign Currency Denominated Award [Member] CHF | Dec. 31, 2014 International Road Transport Union [Member] Litigation Foreign Currency Denominated Award [Member] USD ($) | Dec. 02, 2014 International Road Transport Union [Member] Litigation USD Denominated Award [Member] USD ($) | Jun. 01, 2007 International Road Transport Union [Member] Litigation USD Denominated Award [Member] USD ($) | Jun. 01, 2007 International Road Transport Union [Member] Litigation Expenses and Interest [Member] USD ($) | Jan. 31, 2014 Northrop Grumman Corporation [Member] USD ($) | Jan. 02, 2014 Philips [Member] GBP (£) | Dec. 31, 2014 Philips [Member] USD ($) | Oct. 27, 2014 Mazeikiu Nafta [Member] USD ($) | Dec. 27, 2012 Versicherung Aktiengesellschaft [Member] Litigation Foreign Currency Denominated Award [Member] EUR (€) | Dec. 31, 2014 Versicherung Aktiengesellschaft [Member] Litigation Foreign Currency Denominated Award [Member] USD ($) | Jan. 26, 2015 Subsequent Event [Member] International Road Transport Union [Member] Litigation Foreign Currency Denominated Award [Member] USD ($) | Jan. 26, 2015 Subsequent Event [Member] International Road Transport Union [Member] Litigation Foreign Currency Denominated Award [Member] CHF | Jan. 26, 2015 Subsequent Event [Member] International Road Transport Union [Member] Litigation USD Denominated Award [Member] USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, minimum | $ 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, maximum | 600,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of damages sought |  |  |  | 200,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_OpryMillsMallLimitedPartnershipMember | 125,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_MazeikiuNaftaMember |  |  | 46,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 47,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  | 3,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember | 30,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationExpensesandInterestMember | 340,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_NorthropGrummanCorporationMember | 189,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_PhilipsMember | 294,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_PhilipsMember |  | 183,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_VersicherungAktiengesellschaftMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 223,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_VersicherungAktiengesellschaftMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  |  |
Damages awarded excluding interest and costs |  |  |  |  |  | 17,000,000 aon_LossContingencyDamagesAwardedValueExcludingInterestandCosts / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 16,800,000 aon_LossContingencyDamagesAwardedValueExcludingInterestandCosts / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  |  | 3,100,000 aon_LossContingencyDamagesAwardedValueExcludingInterestandCosts / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  | 28,000,000 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 27,900,000 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  |  | 5,000,000 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember |  |  |  |  |  |  |  |  |  |  |
Legal length of trial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 days |  |  |  |  |
Amount of coverage for damages contended by the insurers |  |  |  | 50,000,000 aon_LossContingencyCoverageFromInsurers / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_OpryMillsMallLimitedPartnershipMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference amount of damages sought by the client |  |  |  | 150,000,000 aon_LossContingencyDamagesDifferenceAmountSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_OpryMillsMallLimitedPartnershipMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_MazeikiuNaftaMember |  |  | 13,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 13,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 4,700,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Settlement agreement terms maximum liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 aon_LossContingencySettlementAgreementTermsMaximumLiability / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 9,500,000 aon_LossContingencySettlementAgreementTermsMaximumLiability / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 75,000 aon_LossContingencySettlementAgreementTermsMaximumLiability / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Estimate of possible loss |  | $ 70,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_PotentialClaimforPensionAdvisoryServicesMember | £ 45,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_PotentialClaimforPensionAdvisoryServicesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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