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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
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Other Financial Data [Abstract] |  |
Taxes receivable | $ 311 aon_OtherTaxAssetsCurrent | $ 204 aon_OtherTaxAssetsCurrent
Prepaid expenses | 164 us-gaap_PrepaidExpenseCurrent | 229 us-gaap_PrepaidExpenseCurrent
Deferred project costs | 102 us-gaap_DeferredCostsCurrent | 98 us-gaap_DeferredCostsCurrent
Other | 25 us-gaap_OtherAssetsMiscellaneousCurrent | 32 us-gaap_OtherAssetsMiscellaneousCurrent
Total Other Current Assets | $ 602 us-gaap_OtherAssetsCurrent | $ 563 us-gaap_OtherAssetsCurrent

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