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v2.4.1.9

Segment Information - Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income from continuing operations before income taxes | $ 635 us-gaap_OperatingIncomeLoss | $ 417 us-gaap_OperatingIncomeLoss | $ 445 us-gaap_OperatingIncomeLoss | $ 469 us-gaap_OperatingIncomeLoss | $ 515 us-gaap_OperatingIncomeLoss | $ 364 us-gaap_OperatingIncomeLoss | $ 382 us-gaap_OperatingIncomeLoss | $ 410 us-gaap_OperatingIncomeLoss | $ 1,966 us-gaap_OperatingIncomeLoss | $ 1,671 us-gaap_OperatingIncomeLoss | $ 1,596 us-gaap_OperatingIncomeLoss
Interest income |  |  |  |  |  |  |  |  | 10 us-gaap_InvestmentIncomeInterestAndDividend | 9 us-gaap_InvestmentIncomeInterestAndDividend | 10 us-gaap_InvestmentIncomeInterestAndDividend
Interest expense |  |  |  |  |  |  |  |  | (255)us-gaap_InterestExpense | (210)us-gaap_InterestExpense | (228)us-gaap_InterestExpense
Other income |  |  |  |  |  |  |  |  | 44 us-gaap_OtherNonoperatingIncomeExpense | 68 us-gaap_OtherNonoperatingIncomeExpense | 2 us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes |  |  |  |  |  |  |  |  | 1,765 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | 1,538 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | 1,380 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Risk Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 1,648 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 1,540 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 1,493 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 485 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 318 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 289 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Total operating segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 2,133 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 1,858 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 1,782 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Unallocated expense [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income from continuing operations before income taxes |  |  |  |  |  |  |  |  | $ (167)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_UnallocatedExpenseToSegmentMember | $ (187)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_UnallocatedExpenseToSegmentMember | $ (186)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = aon_UnallocatedExpenseToSegmentMember

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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + 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 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: 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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