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Employee Benefits - Schedule of expense recognized in Compensation and benefit in the Consolidated Statements of Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Contribution Savings Plans      
U.S. $ 123aon_USDefinedContributionPlanCostRecognized $ 123aon_USDefinedContributionPlanCostRecognized $ 115aon_USDefinedContributionPlanCostRecognized
U.K. 42aon_UKDefinedContributionPlanCostRecognized 45aon_UKDefinedContributionPlanCostRecognized 41aon_UKDefinedContributionPlanCostRecognized
Other 30aon_DefinedContributionPlanCostRecognizedOtherCountries 18aon_DefinedContributionPlanCostRecognizedOtherCountries 13aon_DefinedContributionPlanCostRecognizedOtherCountries
Expense recognized for defined contribution savings plans $ 195us-gaap_DefinedContributionPlanCostRecognized $ 186us-gaap_DefinedContributionPlanCostRecognized $ 169us-gaap_DefinedContributionPlanCostRecognized