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Shareholders' Equity - Redomestication Narrative (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Equity [Abstract] |  |  |
Treasury stock shares cancelled (in shares) | 60 us-gaap_TreasuryStockSharesRetired |  |
Impact of cancellation of treasury shares on ordinary shares | $ 60,000,000 aon_AdjustmentsToCommonStockOnCancellationOfTreasuryShares |  |
Impact of cancellation of treasury shares on Retained earnings | 2,400,000,000 aon_AdjustmentsToRetainedEarningsOnCancellationOfTreasuryShares |  |
Cost of treasury stock shares eliminated | 2,500,000,000 aon_TreasuryStockSharesEliminatedCost |  |
Common stock, par value before redomestication (in dollars per share) | $ 1.00 aon_CommonStockParOrStatedValuePerSharePriorToRedomestication |  |
Common stock, par value (in dollars per share) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Impact of redomestication in ordinary shares | 323,000,000 aon_AdjustmentsToCommonStockOnRedomestication |  |
Impact of redomestication on additional paid-in-capital | 323,000,000 aon_AdjustmentsToAdditionalPaidInCapitalOnRedomestication |  |
Distributable reserves available amount |  | $ 4,000,000,000 aon_DistributableReservesAvailableAmount | $ 5,900,000,000 aon_DistributableReservesAvailableAmount

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- Definition Represents the face amount or stated value of common stock per share prior to the completion of redomestication. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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