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v2.4.1.9

Guarantee of Registered Securities - Narrative (Details) | Dec. 31, 2014 | Nov. 21, 2013
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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 | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes350PercentDue2015Member |
3.125% Senior Notes Percent Due 2016 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate | 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 | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes500PercentDue2020Member |
8.205% Junior Subordinated Deferrable Interest Debentures Percent Due 2027 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate | 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 | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes625PercentDue2040Member |
4.250% Notes Due 2042 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_NotesDue2042At4250PercentMember |
4.45% Notes Due at 2043 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate | 4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_NotesDueat2043at4.45PercentMember |
4.00% senior notes dues November 2023 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = aon_SeniorNotes4.00PercentDue2023Member | 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 | 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 | 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 | 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 | 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 | 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 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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