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v2.4.1.9

Guarantee of Registered Securities (Narrative) (Details) | Mar. 31, 2015
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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

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- Definition The parent's direct and indirect ownership percentage of the subsidiaries that are guarantors of the entity's debt. + References No definition available. + 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 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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