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v2.4.1.9

Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 segment | Mar. 31, 2014
Segment Reporting Information |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |
Total revenue | $ 2,847 us-gaap_Revenues | $ 2,947 us-gaap_Revenues
Total commissions, fees and other revenue | 2,842 aon_CommissionsFeesAndOther | 2,941 aon_CommissionsFeesAndOther
Total fiduciary investment income | 5 aon_FiduciaryInvestmentIncome | 6 aon_FiduciaryInvestmentIncome
Operating income before income tax | 441 us-gaap_OperatingIncomeLoss | 469 us-gaap_OperatingIncomeLoss
Interest income | 3 us-gaap_InvestmentIncomeInterest | 2 us-gaap_InvestmentIncomeInterest
Interest expense | (65)us-gaap_InterestExpense | (58)us-gaap_InterestExpense
Other income | 42 us-gaap_OtherNonoperatingIncomeExpense | 1 us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 421 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | 414 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Total operating segments [Member] |  |
Segment Reporting Information |  |
Operating income before income tax | 488 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 512 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Risk Solutions [Member] |  |
Segment Reporting Information |  |
Total revenue | 1,895 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 1,994 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Total commissions, fees and other revenue | 1,890 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 1,988 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Total fiduciary investment income | 5 aon_FiduciaryInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 6 aon_FiduciaryInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Operating income before income tax | 412 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 445 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Retail brokerage [Member] |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 1,513 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RetailBrokerageRevenuesMember | 1,579 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RetailBrokerageRevenuesMember
Reinsurance brokerage [Member] |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 377 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ReinsuranceBrokerageRevenuesMember | 409 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ReinsuranceBrokerageRevenuesMember
HR Solutions [Member] |  |
Segment Reporting Information |  |
Total revenue | 970 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 965 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Total commissions, fees and other revenue | 970 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 965 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Total fiduciary investment income | 0 aon_FiduciaryInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 0 aon_FiduciaryInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Operating income before income tax | 76 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 67 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Consulting services [Member] |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 371 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingServicesRevenuesMember | 384 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingServicesRevenuesMember
Outsourcing [Member] |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | 604 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_OutsourcingRevenuesMember | 589 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_OutsourcingRevenuesMember
Intrasegment [Member] |  |
Segment Reporting Information |  |
Total commissions, fees and other revenue | (5)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingIntrasegmentEliminationsMember | (8)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingIntrasegmentEliminationsMember
Intersegment elimination [Member] |  |
Segment Reporting Information |  |
Total revenue | (18)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (12)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Total commissions, fees and other revenue | (18)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (12)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Unallocated Expense [Member] |  |
Segment Reporting Information |  |
Operating income before income tax | $ (47)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_UnallocatedExpenseToSegmentMember | $ (43)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_UnallocatedExpenseToSegmentMember

X
- Definition The sum of Commissions, Fees and Other Income. Commissions and fees reflects the total commissions and fees earned from providing services such as (1) brokerage and (2) other such services and activities performed for others. Other income reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References No definition available. + Details
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- Definition Income earned on the interest-bearing assets used as temporary investments of premiums collected from insured's but not yet remitted to insurance companies. + References No definition available. + Details
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- Definition Sum of operating profit and nonoperating income (expense) before income taxes, but includes income (loss) from equity method investments. + References No definition available. + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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