XML 54 R65.htm IDEA: XBRL DOCUMENT 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 2us-gaap_NumberOfReportableSegments  
Total revenue $ 2,847us-gaap_Revenues $ 2,947us-gaap_Revenues
Total commissions, fees and other revenue 2,842aon_CommissionsFeesAndOther 2,941aon_CommissionsFeesAndOther
Total fiduciary investment income 5aon_FiduciaryInvestmentIncome 6aon_FiduciaryInvestmentIncome
Operating income before income tax 441us-gaap_OperatingIncomeLoss 469us-gaap_OperatingIncomeLoss
Interest income 3us-gaap_InvestmentIncomeInterest 2us-gaap_InvestmentIncomeInterest
Interest expense (65)us-gaap_InterestExpense (58)us-gaap_InterestExpense
Other income 42us-gaap_OtherNonoperatingIncomeExpense 1us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 421aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes 414aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Total operating segments [Member]    
Segment Reporting Information    
Operating income before income tax 488us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
512us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Risk Solutions [Member]    
Segment Reporting Information    
Total revenue 1,895us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
1,994us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
Total commissions, fees and other revenue 1,890aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
1,988aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
Total fiduciary investment income 5aon_FiduciaryInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
6aon_FiduciaryInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
Operating income before income tax 412us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
445us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RiskAndInsuranceBrokerageServicesMember
Retail brokerage [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 1,513aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RetailBrokerageRevenuesMember
1,579aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_RetailBrokerageRevenuesMember
Reinsurance brokerage [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 377aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ReinsuranceBrokerageRevenuesMember
409aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ReinsuranceBrokerageRevenuesMember
HR Solutions [Member]    
Segment Reporting Information    
Total revenue 970us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
965us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
Total commissions, fees and other revenue 970aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
965aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
Total fiduciary investment income 0aon_FiduciaryInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
0aon_FiduciaryInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
Operating income before income tax 76us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
67us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingMember
Consulting services [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 371aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingServicesRevenuesMember
384aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_ConsultingServicesRevenuesMember
Outsourcing [Member]    
Segment Reporting Information    
Total commissions, fees and other revenue 604aon_CommissionsFeesAndOther
/ us-gaap_StatementBusinessSegmentsAxis
= aon_OutsourcingRevenuesMember
589aon_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