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v3.5.0.2

Guarantee of Registered Securities (Narrative) (Details) | Sep. 30, 2016 | Mar. 01, 2016
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Aon plc [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Parent company's percentage ownership of guarantors | 100.00% |
5.00% Senior notes due September 2020 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 5.00% |
8.205% Junior subordinated deferrable interest debentures due January 2027 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 8.205% |
6.25% Senior notes due September 2040 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 6.25% |
4.250% Senior notes due 2042 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.25% |
4.45% notes due 2043 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.45% |
4.00% notes due 2023 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.00% |
2.875% notes due 2026 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 2.875% |
3.50% Notes due June 2024 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 3.50% |
4.60% notes due May 2044 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.60% |
4.75% Notes Due May 2045 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.75% |
3.50% notes due 2024 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 3.50% |
4.60% notes due 2044 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.60% |
4.75% Notes Due 2045 [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 4.75% |
Two Point Eight Zero Percent Senior Notes Due Twenty Twenty One [Member] | Senior Notes [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 2.80% |
3.875% due in December 2025 [Member] | Senior Notes [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) | 3.875% | 3.875%

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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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