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Guarantee of Registered Securities (Narrative) (Details)
Mar. 31, 2015
Aon plc [Member]  
Condensed Financial Statements, Captions [Line Items]  
Parent company's percentage ownership of guarantors 100.00%aon_SubsidiaryGuarantorsPercentageOwned
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3.50% senior notes due September 2015 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes350PercentDue2015Member
3.125% Senior notes due 2016 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 3.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes3Point125PercentDue2016Member
5.00% Senior notes due September 2020 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes500PercentDue2020Member
8.205% Junior subordinated deferrable interest debentures due January 2027 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 8.205%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_JuniorSubordinatedDeferrableInterestDebentures8Point205PercentDue2027Member
6.25% Senior notes due September 2040 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes625PercentDue2040Member
4.250% Senior notes due 2042 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_NotesDue2042At4250PercentMember
4.45% notes due 2043 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_NotesDueat2043at4.45PercentMember
4.00% notes due 2023 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_SeniorNotes4.00PercentDue2023Member
2.875% notes due 2026 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 2.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_A2.875notesdue2026Member
3.50% Notes due June 2024 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_A3.50NotesdueJune2024Member
4.60% notes due May 2044 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 4.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_A4.60notesdueMay2044Member
3.50% notes due 2024 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_A3.50notesdue2024Member
4.60% notes due 2044 [Member]  
Condensed Financial Statements, Captions [Line Items]  
Debt interest rate percentage 4.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= aon_A4.60notesdue2044Member