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Debt - Summary of outstanding debt (Details) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 2.875% notes due 2026 [Member] USD ($) | Dec. 31, 2013 2.875% notes due 2026 [Member] USD ($) | Dec. 31, 2014 3.50% senior notes due September 2015 [Member] USD ($) | Dec. 31, 2013 3.50% senior notes due September 2015 [Member] USD ($) | Dec. 31, 2014 5.00% Senior notes due September 2020 [Member] USD ($) | Dec. 31, 2013 5.00% Senior notes due September 2020 [Member] USD ($) | Dec. 31, 2014 3.50% senior notes due June 2024 [Member] USD ($) | Dec. 31, 2013 3.50% senior notes due June 2024 [Member] USD ($) | Dec. 31, 2014 4.60% notes due 2044 [Member] USD ($) | Dec. 31, 2013 4.60% notes due 2044 [Member] USD ($) | Dec. 31, 2014 8.205% junior subordinated deferrable interest debentures due January 2027 [Member] USD ($) | Dec. 31, 2013 8.205% junior subordinated deferrable interest debentures due January 2027 [Member] USD ($) | Dec. 31, 2012 8.205% junior subordinated deferrable interest debentures due January 2027 [Member] | Dec. 31, 2014 3.125% senior notes due May 2016 [Member] USD ($) | Dec. 31, 2013 3.125% senior notes due May 2016 [Member] USD ($) | Dec. 31, 2014 4.00% senior notes dues November 2023 [Member] USD ($) | Dec. 31, 2013 4.00% senior notes dues November 2023 [Member] USD ($) | Nov. 21, 2013 4.00% senior notes dues November 2023 [Member] USD ($) | Dec. 31, 2014 4.76% CAD 375 debt securities due March 2018 [Member] USD ($) | Dec. 31, 2014 4.76% CAD 375 debt securities due March 2018 [Member] CAD | Dec. 31, 2013 4.76% CAD 375 debt securities due March 2018 [Member] USD ($) | Dec. 31, 2014 6.25% Senior notes due September 2040 [Member] USD ($) | Dec. 31, 2013 6.25% Senior notes due September 2040 [Member] USD ($) | Dec. 31, 2014 4.45% senior notes due May 2043 [Member] USD ($) | Dec. 31, 2013 4.45% senior notes due May 2043 [Member] USD ($) | May 21, 2013 4.45% senior notes due May 2043 [Member] USD ($) | Dec. 31, 2014 4.25% senior notes due December 2042 [Member] USD ($) | Dec. 31, 2013 4.25% senior notes due December 2042 [Member] USD ($) | Apr. 15, 2013 4.25% senior notes due December 2042 [Member] USD ($) | Mar. 08, 2013 4.25% senior notes due December 2042 [Member] USD ($) | Dec. 12, 2012 4.25% senior notes due December 2042 [Member] USD ($) | Dec. 31, 2014 6.25% EUR 500 debt securities due July 2014 [Member] USD ($) | Dec. 31, 2014 6.25% EUR 500 debt securities due July 2014 [Member] EUR (€) | Dec. 31, 2013 6.25% EUR 500 debt securities due July 2014 [Member] USD ($) | Dec. 31, 2014 Commercial Paper [Member] USD ($) | Dec. 31, 2013 Commercial Paper [Member] USD ($) | Dec. 31, 2014 Other [Member] USD ($) | Dec. 31, 2013 Other [Member] USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 5,582,000,000 us-gaap_DebtAndCapitalLeaseObligations | $ 4,389,000,000 us-gaap_DebtAndCapitalLeaseObligations | $ 605,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_A2.875notesdue2026Member | $ 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_A2.875notesdue2026Member | $ 599,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes350PercentDue2015Member | $ 599,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes350PercentDue2015Member | $ 599,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes500PercentDue2020Member | $ 599,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes500PercentDue2020Member | $ 597,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_A3.50SeniorNotesdueJune2024Member | $ 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_A3.50SeniorNotesdueJune2024Member | $ 549,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_A4.60notesdue2044Member | $ 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_A4.60notesdue2044Member | $ 521,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member | $ 521,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member |  | $ 500,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes3.125PercentDue2016Member | $ 500,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes3.125PercentDue2016Member | $ 349,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.00PercentDue2023Member | $ 349,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.00PercentDue2023Member |  | $ 322,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member |  | $ 352,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member | $ 298,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes625PercentDue2040Member | $ 298,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes625PercentDue2040Member | $ 248,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.45PercentDue2043Member | $ 248,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.45PercentDue2043Member |  | $ 196,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member | $ 195,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member |  |  |  | $ 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_DebtSecurities6.25PercentDue2014Member |  | $ 685,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = aon_DebtSecurities6.25PercentDue2014Member | $ 168,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CommercialPaperMember | $ 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CommercialPaperMember | $ 31,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | $ 43,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Less short-term and current portion of long-term debt | 783,000,000 us-gaap_DebtCurrent | 703,000,000 us-gaap_DebtCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 4,799,000,000 us-gaap_LongTermDebtNoncurrent | 3,686,000,000 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt |  |  | 2.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_A2.875notesdue2026Member |  | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes350PercentDue2015Member |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes500PercentDue2020Member |  | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_A3.50SeniorNotesdueJune2024Member |  | 4.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_A4.60notesdue2044Member |  | 8.205%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member |  | 8.205%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member | 3.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes3.125PercentDue2016Member |  | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.00PercentDue2023Member |  | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.00PercentDue2023Member | 4.76%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member | 4.76%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member |  | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes625PercentDue2040Member |  | 4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.45PercentDue2043Member |  | 4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.45PercentDue2043Member | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member |  | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_DebtSecurities6.25PercentDue2014Member | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_DebtSecurities6.25PercentDue2014Member |  |  |  |  |
Debt face value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.00PercentDue2023Member |  | 375,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member |  |  |  |  |  | $ 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.45PercentDue2043Member |  |  | $ 256,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member | $ 90,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member | $ 166,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.25PercentDue2042Member |  | € 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = aon_DebtSecurities6.25PercentDue2014Member |  |  |  |  |

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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