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Guarantee of Registered Securities - Narrative (Details) - USD ($) $ in Millions | Jul. 13, 2018 | Jun. 30, 2018
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Aon plc |  |
Condensed Financial Statements, Captions [Line Items] |  |
Parent company's percentage ownership of guarantors |  | 100.00%
5.00% Senior notes due September 2020 |  |
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 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 8.205%
6.25% Senior notes due September 2040 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 6.25%
4.250% Senior notes due 2042 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 4.25%
4.45% notes due 2043 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 4.45%
4.00% notes due 2023 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 4.00%
2.875% notes due 2026 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 2.875%
3.50% Notes due June 2024 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 3.50%
4.60% notes due May 2044 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 4.60%
4.75% Notes Due May 2045 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 4.75%
2.80% Senior Notes Due 2021 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 2.80%
3.875% due in December 2025 |  |
Condensed Financial Statements, Captions [Line Items] |  |
Debt interest rate percentage (as a percent) |  | 3.875%
Aon Global Holdings Limited | AON Corporation | Subsequent Event |  |
Condensed Financial Statements, Captions [Line Items] |  |
Dividends | $ 750 |

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