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Other Financial Data Schedule of Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other Financial Data [Abstract]    
Taxes receivable $ 218aon_OtherTaxAssetsCurrent $ 99aon_OtherTaxAssetsCurrent
Deferred tax assets 206us-gaap_DeferredTaxAssetsNetCurrent 212us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses 158us-gaap_PrepaidExpenseCurrent 164us-gaap_PrepaidExpenseCurrent
Deferred project costs 108us-gaap_DeferredCostsCurrent 102us-gaap_DeferredCostsCurrent
Other 22us-gaap_OtherAssetsMiscellaneousCurrent 25us-gaap_OtherAssetsMiscellaneousCurrent
Total $ 712us-gaap_OtherAssetsCurrent $ 602us-gaap_OtherAssetsCurrent