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Summary of Significant Accounting Principles and Practices (Details) | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 GBP (£) | Dec. 31, 2013 GBP (£) | Dec. 31, 2011 USD ($) | Dec. 31, 2014 Buildings [Member] | Dec. 31, 2014 Automobiles [Member] | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Minimum [Member] Software [Member] | Dec. 31, 2014 Minimum [Member] Furniture, fixtures and equipment [Member] | Dec. 31, 2014 Minimum [Member] Computer equipment [Member] | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Maximum [Member] Software [Member] | Dec. 31, 2014 Maximum [Member] Leasehold improvements [Member] | Dec. 31, 2014 Maximum [Member] Furniture, fixtures and equipment [Member] | Dec. 31, 2014 Maximum [Member] Computer equipment [Member] | Dec. 31, 2014 Weighted average [Member]
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of outsourcing contracts for benefit services |  |  |  |  |  |  |  |  | 3 years |  |  |  | 5 years |  |  |  |  |
Term of outsourcing contracts for HR BPO services |  |  |  |  |  |  |  |  | 5 years |  |  |  | 10 years |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and short-term investments | $ 768,000,000 aon_CashandCashEquivalentsandShortTermInvestments | $ 1,000,000,000 aon_CashandCashEquivalentsandShortTermInvestments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and investments, current | 169,000,000 us-gaap_RestrictedCashAndInvestmentsCurrent | 214,000,000 us-gaap_RestrictedCashAndInvestmentsCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating funds in U.K. | 63,000,000 aon_RestrictedCashOperatingFunds | 126,000,000 aon_RestrictedCashOperatingFunds |  | 40,500,000.0 aon_RestrictedCashOperatingFunds | 77,000,000 aon_RestrictedCashOperatingFunds |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, restricted | 106,000,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 88,000,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiduciary Assets and Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium trust balances | 4,000,000,000 aon_FiduciaryAssetsPremiumTrustBalances | 3,800,000,000 aon_FiduciaryAssetsPremiumTrustBalances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | 74,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 90,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 118,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  | 104,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  |  |  |  |  |  |  |  |  |
Fixed Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets, original life, weighted-average |  |  |  |  |  |  | 35 years | 6 years |  | 4 years | 4 years | 4 years |  | 7 years | 10 years | 10 years | 6 years |
Goodwill and Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of finite-lived intangible assets |  |  |  |  |  |  |  |  | 1 year |  |  |  | 16 years |  |  |  |  | 11 years
Foreign Currency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of foreign exchange gains (losses) on the consolidated statements of income | (1,000,000)aon_ForeignCurrencyTransactionGainLossBeforeTaxIncludingHedging | 3,000,000 aon_ForeignCurrencyTransactionGainLossBeforeTaxIncludingHedging | (16,000,000)aon_ForeignCurrencyTransactionGainLossBeforeTaxIncludingHedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative (loss) gain | $ (19,000,000)us-gaap_DerivativeGainLossOnDerivativeNet | $ (10,000,000)us-gaap_DerivativeGainLossOnDerivativeNet | $ 3,000,000 us-gaap_DerivativeGainLossOnDerivativeNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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