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Goodwill and Other Intangible Assets - Schedule of estimated future amortization expense on intangible assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Finite-Lived Intangible Assets [Line Items] |
2015 | $ 322 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 | 278 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 | 232 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 | 172 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 | 143 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter | 354 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total future amortization of intangible assets | 1,501 us-gaap_FiniteLivedIntangibleAssetsNet
Risk Solutions [Member] |
Finite-Lived Intangible Assets [Line Items] |
2015 | 113 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
2016 | 103 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
2017 | 93 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
2018 | 80 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
2019 | 69 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Thereafter | 186 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Total future amortization of intangible assets | 644 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
HR Solutions [Member] |
Finite-Lived Intangible Assets [Line Items] |
2015 | 209 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
2016 | 175 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
2017 | 139 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
2018 | 92 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
2019 | 74 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Thereafter | 168 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Total future amortization of intangible assets | $ 857 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember

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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for 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)(3) -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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