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v2.4.1.9

Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | $ 136 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ (11)us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 3 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments | 42 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments
Purchases of long-term investments | (1)us-gaap_PaymentsToAcquireOtherInvestments | (10)us-gaap_PaymentsToAcquireOtherInvestments
Net sales of short-term investments - non-fiduciary | 42 aon_PaymentsForProceedsFromMarketableSecurities | 183 aon_PaymentsForProceedsFromMarketableSecurities
Acquisition of businesses, net of cash acquired | (21)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (5)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from sale of businesses | 41 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | 1 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Capital expenditures | (62)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (55)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
CASH PROVIDED BY INVESTING ACTIVITIES | 2 us-gaap_NetCashProvidedByUsedInInvestingActivities | 156 us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | (250)us-gaap_PaymentsForRepurchaseOfCommonStock | (600)us-gaap_PaymentsForRepurchaseOfCommonStock
Advances from (to) affiliates | 0 us-gaap_IncreaseDecreaseInDueToAffiliates | 0 us-gaap_IncreaseDecreaseInDueToAffiliates
Issuance of shares for employee benefit plans | 48 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions | 26 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Issuance of debt | 870 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 1,195 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayment of debt | (686)us-gaap_RepaymentsOfLongTermDebt | (829)us-gaap_RepaymentsOfLongTermDebt
Cash dividends to shareholders | (71)us-gaap_PaymentsOfDividendsCommonStock | (53)us-gaap_PaymentsOfDividendsCommonStock
Purchase of shares from noncontrolling interests | (5)us-gaap_PaymentsToMinorityShareholders | 1 us-gaap_PaymentsToMinorityShareholders
Dividends paid to noncontrolling interests | (1)us-gaap_PaymentsOfDividendsMinorityInterest | 0 us-gaap_PaymentsOfDividendsMinorityInterest
Proceeds from sale-leaseback | 0 us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities |
CASH USED FOR FINANCING ACTIVITIES | (95)us-gaap_NetCashProvidedByUsedInFinancingActivities | (260)us-gaap_NetCashProvidedByUsedInFinancingActivities
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (39)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (24)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | 4 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (139)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 374 us-gaap_CashAndCashEquivalentsAtCarryingValue | 477 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 378 us-gaap_CashAndCashEquivalentsAtCarryingValue | 338 us-gaap_CashAndCashEquivalentsAtCarryingValue
Aon plc [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 2 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 0 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of long-term investments | 0 us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net sales of short-term investments - non-fiduciary | 0 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Acquisition of businesses, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from sale of businesses | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Capital expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH PROVIDED BY INVESTING ACTIVITIES | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | (250)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (600)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Advances from (to) affiliates | 157 us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 313 us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of shares for employee benefit plans | 48 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 26 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of debt | 114 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 293 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Repayment of debt | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (68)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash dividends to shareholders | (71)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (53)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of shares from noncontrolling interests | 0 us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends paid to noncontrolling interests | 0 us-gaap_PaymentsOfDividendsMinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds from sale-leaseback | 0 us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
CASH USED FOR FINANCING ACTIVITIES | (2)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (89)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Aon Corporation [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | (188)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (123)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 0 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 37 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Purchases of long-term investments | (1)us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (10)us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net sales of short-term investments - non-fiduciary | (1)aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 62 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Acquisition of businesses, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from sale of businesses | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Capital expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
CASH PROVIDED BY INVESTING ACTIVITIES | (2)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 89 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Advances from (to) affiliates | (385)us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (206)us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Issuance of shares for employee benefit plans | 0 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Issuance of debt | 756 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 902 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Repayment of debt | (678)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (755)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash dividends to shareholders | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Purchase of shares from noncontrolling interests | 0 us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Dividends paid to noncontrolling interests | 0 us-gaap_PaymentsOfDividendsMinorityInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Proceeds from sale-leaseback | 0 us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
CASH USED FOR FINANCING ACTIVITIES | (307)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (59)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (497)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (93)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 2,727 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 247 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 2,230 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 154 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other Non-Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 322 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 23 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 3 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 5 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Purchases of long-term investments | 0 us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net sales of short-term investments - non-fiduciary | 43 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 121 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Acquisition of businesses, net of cash acquired | (21)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (5)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from sale of businesses | 41 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Capital expenditures | (62)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (55)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
CASH PROVIDED BY INVESTING ACTIVITIES | 4 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 67 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Advances from (to) affiliates | (984)us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 65 us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Issuance of shares for employee benefit plans | 0 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Issuance of debt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Repayment of debt | (8)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (6)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash dividends to shareholders | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Purchase of shares from noncontrolling interests | (5)us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1 us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Dividends paid to noncontrolling interests | (1)us-gaap_PaymentsOfDividendsMinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Proceeds from sale-leaseback | 0 us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
CASH USED FOR FINANCING ACTIVITIES | (998)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 60 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (39)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (24)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (711)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 126 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 1,361 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,246 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 650 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,372 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 0 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Purchases of long-term investments | 0 us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquireOtherInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net sales of short-term investments - non-fiduciary | 0 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 aon_PaymentsForProceedsFromMarketableSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Acquisition of businesses, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Proceeds from sale of businesses | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Capital expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
CASH PROVIDED BY INVESTING ACTIVITIES | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Advances from (to) affiliates | 1,212 us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (172)us-gaap_IncreaseDecreaseInDueToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Issuance of shares for employee benefit plans | 0 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Issuance of debt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
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