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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 ($)
Debt Instrument [Line Items]                                                                                
Total debt $ 5,582,000,000us-gaap_DebtAndCapitalLeaseObligations $ 4,389,000,000us-gaap_DebtAndCapitalLeaseObligations $ 605,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_A2.875notesdue2026Member		 $ 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_A2.875notesdue2026Member		 $ 599,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes350PercentDue2015Member		 $ 599,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes350PercentDue2015Member		 $ 599,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes500PercentDue2020Member		 $ 599,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes500PercentDue2020Member		 $ 597,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_A3.50SeniorNotesdueJune2024Member		 $ 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_A3.50SeniorNotesdueJune2024Member		 $ 549,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_A4.60notesdue2044Member		 $ 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_A4.60notesdue2044Member		 $ 521,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member		 $ 521,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member		   $ 500,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes3.125PercentDue2016Member		 $ 500,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes3.125PercentDue2016Member		 $ 349,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.00PercentDue2023Member		 $ 349,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.00PercentDue2023Member		   $ 322,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member		   $ 352,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member		 $ 298,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes625PercentDue2040Member		 $ 298,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes625PercentDue2040Member		 $ 248,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.45PercentDue2043Member		 $ 248,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.45PercentDue2043Member		   $ 196,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.25PercentDue2042Member		 $ 195,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.25PercentDue2042Member		       $ 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_DebtSecurities6.25PercentDue2014Member		   $ 685,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= aon_DebtSecurities6.25PercentDue2014Member		 $ 168,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember		 $ 0us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember		 $ 31,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 $ 43,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Less short-term and current portion of long-term debt 783,000,000us-gaap_DebtCurrent 703,000,000us-gaap_DebtCurrent                                                                            
Long-term debt 4,799,000,000us-gaap_LongTermDebtNoncurrent 3,686,000,000us-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                                       $ 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.00PercentDue2023Member		   375,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorUnsecuredDebtSecurities4.768PercentDue2018Member		           $ 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.45PercentDue2043Member		     $ 256,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.25PercentDue2042Member		 $ 90,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.25PercentDue2042Member		 $ 166,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.25PercentDue2042Member		   € 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= aon_DebtSecurities6.25PercentDue2014Member