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Income Taxes - Reconciliation of the income tax provisions based on the U.S. statutory corporate tax rate to the provisions reflected in the Consolidated Financial Statements (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of the income tax provisions based on the statutory corporate tax rate to the provisions reflected in the Consolidated Financial Statements      
Statutory tax rate 21.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 23.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 24.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
U.S. state income taxes, net of U.S. federal benefit 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Taxes on international operations (8.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential [1] (4.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential [1] 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential [1]
Nondeductible expenses 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Adjustments to prior year tax requirements 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Deferred tax adjustments, including statutory rate changes (0.70%)aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChanges 1.40%aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChanges 0.70%aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChanges
Deferred tax adjustments, international earnings 1.00%aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsInternationalEarnings 3.30%aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsInternationalEarnings 0.00%aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsInternationalEarnings
Adjustments to valuation allowances 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (5.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in uncertain tax positions 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Other — net (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 18.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 25.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations
[1] The Company determines the adjustment for taxes on international operations based on the difference between the statutory tax rate applicable to earnings in each foreign jurisdiction and the enacted rate of 21.5%, 23% and 24% at December 31, 2014, 2013 and 2012, respectively. In 2014 and 2013, the benefit to the Company's effective income tax rate from taxes on international operations relates to benefits from lower-taxed global operations, primarily due to the use of global funding structures.