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Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Intangible assets with indefinite lives |  |  |
Tradenames | $ 1,019 us-gaap_IndefiniteLivedTrademarks |  | $ 1,019 us-gaap_IndefiniteLivedTrademarks
Intangible assets with finite lives |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 4,461 us-gaap_FiniteLivedIntangibleAssetsGross |  | 4,542 us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets with finite lives, Accumulated Amortization | 2,051 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 2,022 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, Net Carrying Amount | 2,410 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 2,520 us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense on intangible assets | 80 us-gaap_AmortizationOfIntangibleAssets | 86 us-gaap_AmortizationOfIntangibleAssets |
Estimated amortization for intangible assets |  |  |
Remainder of 2015 | 234 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |
2016 | 271 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2017 | 227 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2018 | 169 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2019 | 142 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
Thereafter | 348 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |
Total | 1,391 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Risk Solutions [Member] |  |  |
Estimated amortization for intangible assets |  |  |
Remainder of 2015 | 80 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
2016 | 99 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
2017 | 90 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
2018 | 78 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
2019 | 69 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
Thereafter | 185 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
Total | 601 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember |  |
HR Solutions [Member] |  |  |
Estimated amortization for intangible assets |  |  |
Remainder of 2015 | 154 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
2016 | 172 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
2017 | 137 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
2018 | 91 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
2019 | 73 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
Thereafter | 163 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
Total | 790 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember |  |
Customer related and contract based [Member] |  |  |
Intangible assets with finite lives |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 2,894 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_CustomerRelatedAndContractBasedMember |  | 2,952 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_CustomerRelatedAndContractBasedMember
Intangible assets with finite lives, Accumulated Amortization | 1,616 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_CustomerRelatedAndContractBasedMember |  | 1,579 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_CustomerRelatedAndContractBasedMember
Intangible assets, Net Carrying Amount | 1,278 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_CustomerRelatedAndContractBasedMember |  | 1,373 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_CustomerRelatedAndContractBasedMember
Marketing, technology and other [Member] |  |  |
Intangible assets with finite lives |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 548 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_MarketingTechnologyAndOtherMember |  | 571 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_MarketingTechnologyAndOtherMember
Intangible assets with finite lives, Accumulated Amortization | 435 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_MarketingTechnologyAndOtherMember |  | 443 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_MarketingTechnologyAndOtherMember
Intangible assets, Net Carrying Amount | $ 113 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_MarketingTechnologyAndOtherMember |  | $ 128 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aon_MarketingTechnologyAndOtherMember

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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