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v2.4.1.9

Employee Benefits - Schedule of expense recognized in Compensation and benefit in the Consolidated Statements of Income (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Contribution Savings Plans |  |  |
U.S. | $ 123 aon_USDefinedContributionPlanCostRecognized | $ 123 aon_USDefinedContributionPlanCostRecognized | $ 115 aon_USDefinedContributionPlanCostRecognized
U.K. | 42 aon_UKDefinedContributionPlanCostRecognized | 45 aon_UKDefinedContributionPlanCostRecognized | 41 aon_UKDefinedContributionPlanCostRecognized
Other | 30 aon_DefinedContributionPlanCostRecognizedOtherCountries | 18 aon_DefinedContributionPlanCostRecognizedOtherCountries | 13 aon_DefinedContributionPlanCostRecognizedOtherCountries
Expense recognized for defined contribution savings plans | $ 195 us-gaap_DefinedContributionPlanCostRecognized | $ 186 us-gaap_DefinedContributionPlanCostRecognized | $ 169 us-gaap_DefinedContributionPlanCostRecognized

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- Definition Defined Contribution Plan, Cost Recognized, Other Countries + References No definition available. + Details
Name: | aon_DefinedContributionPlanCostRecognizedOtherCountries
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration