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v2.4.1.9

Income Taxes - Income from continuing operations before income tax (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income before income taxes: |  |  |
Income from continuing operations before income taxes | $ 1,765 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | $ 1,538 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes | $ 1,380 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Current: |  |  |
Total current | 468 us-gaap_CurrentIncomeTaxExpenseBenefit | 404 us-gaap_CurrentIncomeTaxExpenseBenefit | 455 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit): |  |  |
Total deferred | (134)us-gaap_DeferredIncomeTaxExpenseBenefit | (14)us-gaap_DeferredIncomeTaxExpenseBenefit | (95)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income taxes expenses | 334 us-gaap_IncomeTaxExpenseBenefit | 390 us-gaap_IncomeTaxExpenseBenefit | 360 us-gaap_IncomeTaxExpenseBenefit
U.K. [Member] |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | 347 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 96 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 36 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Current: |  |  |
Total current | 1 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | (18)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | (10)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred tax expense (benefit): |  |  |
Total deferred | 38 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 43 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 46 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
U.S. [Member] |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | (55)aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 349 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 468 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Current: |  |  |
Total current | 156 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 111 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 170 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Deferred tax expense (benefit): |  |  |
Total deferred | (133)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | (48)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | (83)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
U.S. state and local [Member] |  |  |
Current: |  |  |
Total current | 75 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 52 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 57 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Deferred tax expense (benefit): |  |  |
Total deferred | (24)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 10 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | (10)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Other [Member] |  |  |
Income before income taxes: |  |  |
Income from continuing operations before income taxes | 1,473 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember | 1,093 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember | 876 aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxes / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember
Current: |  |  |
Total current | 236 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember | 259 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember | 238 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember
Deferred tax expense (benefit): |  |  |
Total deferred | $ (15)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember | $ (19)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember | $ (48)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = aon_OtherCountryMember

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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 current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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