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Employee Benefits - Schedule of expense recognized in Compensation and benefit in the Consolidated Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Contribution Savings Plans |  |  |
U.S. | $ 133 | $ 123 | $ 123
U.K. | 42 | 42 | 45
Other | 25 | 30 | 18
Expense recognized for defined contribution savings plans | $ 200 | $ 195 | $ 186

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- Definition Defined Contribution Plan, Cost Recognized, Other Countries + References No definition available. + Details
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- Definition The cost recognized during the period for U.K. defined contribution plans. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition The cost recognized during the period for U.S. defined contribution plans. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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