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Other Financial Data - Schedule of Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Financial Data [Abstract]    
Taxes receivable $ 311aon_OtherTaxAssetsCurrent $ 204aon_OtherTaxAssetsCurrent
Prepaid expenses 164us-gaap_PrepaidExpenseCurrent 229us-gaap_PrepaidExpenseCurrent
Deferred project costs 102us-gaap_DeferredCostsCurrent 98us-gaap_DeferredCostsCurrent
Other 25us-gaap_OtherAssetsMiscellaneousCurrent 32us-gaap_OtherAssetsMiscellaneousCurrent
Total Other Current Assets $ 602us-gaap_OtherAssetsCurrent $ 563us-gaap_OtherAssetsCurrent