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v2.4.1.9

Commitments and Contingencies (Details) |  |  |  |  | 3 Months Ended |  | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended
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Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 Potential Claim for Pension Advisory Services [Member] USD ($) | Apr. 30, 2014 Potential Claim for Pension Advisory Services [Member] GBP (£) | Mar. 31, 2015 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($) | Dec. 31, 2014 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($) | Jan. 31, 2014 Northrop Grumman Corporation [Member] USD ($) | Sep. 14, 2010 Opry Mills Mall Limited Partnership [Member] USD ($) | Mar. 31, 2015 Opry Mills Mall Limited Partnership [Member] USD ($) | Mar. 31, 2015 Philips [Member] USD ($) | Jan. 02, 2014 Philips [Member] GBP (£) | Mar. 31, 2015 International Road Transport Union [Member] Litigation Award [Member] USD ($) | Jan. 26, 2015 International Road Transport Union [Member] Litigation Award [Member] CHF | Dec. 02, 2014 International Road Transport Union [Member] Litigation Award [Member] CHF | Jun. 01, 2007 International Road Transport Union [Member] Litigation Award [Member] CHF | Dec. 31, 2014 International Road Transport Union [Member] Litigation Award [Member] CHF | Jan. 26, 2015 International Road Transport Union [Member] Litigation USD 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 ($) | Dec. 31, 2014 International Road Transport Union [Member] Litigation USD Denominated Award [Member] USD ($) | Jun. 01, 2007 International Road Transport Union [Member] Litigation Expenses and Interest [Member] USD ($) | Mar. 31, 2015 Versicherung Aktiengesellschaft [Member] Litigation Award [Member] USD ($) | Dec. 27, 2012 Versicherung Aktiengesellschaft [Member] Litigation Award [Member] EUR (€)
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, minimum | $ 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, maximum | 600,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  | 340,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_NorthropGrummanCorporationMember | 200,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_OpryMillsMallLimitedPartnershipMember |  | 281,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_PhilipsMember | 189,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_PhilipsMember | 48,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  |  | 46,000,000 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 | 199,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_VersicherungAktiengesellschaftMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 183,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = aon_VersicherungAktiengesellschaftMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember
Amount of coverage for damages contended by the insurers |  |  |  |  |  |  |  | 50,000,000 aon_LossContingencyCoverageFromInsurers / us-gaap_LitigationCaseAxis = aon_OpryMillsMallLimitedPartnershipMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference amount of damages sought by the client |  |  |  |  |  |  |  | 150,000,000 aon_LossContingencyDamagesDifferenceAmountSoughtValue / us-gaap_LitigationCaseAxis = aon_OpryMillsMallLimitedPartnershipMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 200,000,000 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LitigationCaseAxis = aon_OpryMillsMallLimitedPartnershipMember |  |  | 29,000,000 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 |  |  |
Case settlement amount |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 12,800,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  |  |  | 4,700,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember |  |  |  |  |  |
Settlement, maximum liability |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 aon_LossContingencySettlementAgreementTermsMaximumLiability / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember | 8,700,000 aon_LossContingencySettlementAgreementTermsMaximumLiability / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationForeignCurrencyDenominatedAwardMember |  |  |  | 115,000 aon_LossContingencySettlementAgreementTermsMaximumLiability / us-gaap_LitigationCaseAxis = aon_InternationalRoadTransportUnionMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_LitigationUSDDenominatedAwardMember |  |  |  |  |  |
Estimate of possible loss |  |  | 67,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_PotentialClaimforPensionAdvisoryServicesMember | 45,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = aon_PotentialClaimforPensionAdvisoryServicesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum potential funding under commitments | 77,000,000 us-gaap_GuaranteeObligationsMaximumExposure | 112,000,000 us-gaap_GuaranteeObligationsMaximumExposure |  |  | 12,000,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialGuaranteeMember | 14,000,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialGuaranteeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding | 68,000,000 us-gaap_LettersOfCreditOutstandingAmount | 95,000,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments funded |  |  |  |  | $ 2,000,000 aon_PartnershipObligationsFunded / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_FinancialGuaranteeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition This element represents the amount of coverage as contended by the insurers for the loss. + References No definition available. + Details
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Balance Type: | credit
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- Definition Loss Contingency Damages Awarded Value Excluding Interest and Costs + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition This element represents the difference amount of damages sought by the client after adjusting for amount claimed from insurers. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
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- Definition Loss Contingency, Settlement Agreement, Terms, Maximum Liability + References No definition available. + Details
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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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Balance Type: | debit
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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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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Details
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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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