Debt	6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]
Debt	Debt Revolving Credit Facilities As of June 30, 2016, Aon plc had two primary committed credit facilities outstanding: its $400 million U.S. credit facility expiring in March 2017 (the "2017 Facility") and its $900 million multi-currency U.S. credit facility expiring in February 2021 (the "2021 Facility"). Each of these facilities includes customary representations, warranties and covenants, including financial covenants that require Aon plc to maintain specified ratios of adjusted consolidated EBITDA to consolidated interest expense and consolidated debt to adjusted consolidated EBITDA, in each case, tested quarterly. At June 30, 2016, Aon plc did not have borrowings under either the 2017 Facility or the 2021 Facility, and was in compliance with all covenants contained therein during the six months ended June 30, 2016. Commercial Paper Aon Corporation, a wholly-owned subsidiary of Aon plc, has established a U.S. commercial paper program, which provides for commercial paper to be issued in an aggregate principal amount of up to $900 million, and a European multi-currency commercial paper program, which provides for commercial paper to be issued in an aggregate principal amount of up to €300 million. The U.S. commercial paper program is fully and unconditionally guaranteed by Aon plc and the European commercial paper program is fully and unconditionally guaranteed by Aon Corporation. In the aggregate, the Company had $241 million and $50 million of commercial paper outstanding at June 30, 2016 and December 31, 2015, respectively, which is included in Short-term debt and current portion of long-term debt in the Company's Condensed Consolidated Statements of Financial Position. The weighted average commercial paper outstanding for the three and six months ended June 30, 2016, respectively, was $304 million and $240 million. The weighted average interest rate of the commercial paper outstanding for the three and six months ended June 30, 2016 was 0.59% and 0.41%, respectively. Notes On March 1, 2016, Aon plc issued $750 million of 3.875% Senior Notes due December 2025. The Company used the proceeds of the issuance for general corporate purposes. On May 27, 2016, $500 million of 3.125% Senior Notes issued by Aon Corporation matured and were repaid in full.

Debt

Revolving Credit Facilities

As of June 30, 2016, Aon plc had two primary committed credit facilities outstanding: its $400 million U.S. credit facility expiring in March 2017 (the "2017 Facility") and its $900 million multi-currency U.S. credit facility expiring in February 2021 (the "2021 Facility").

Each of these facilities includes customary representations, warranties and covenants, including financial covenants that require Aon plc to maintain specified ratios of adjusted consolidated EBITDA to consolidated interest expense and consolidated debt to adjusted consolidated EBITDA, in each case, tested quarterly. At June 30, 2016, Aon plc did not have borrowings under either the 2017 Facility or the 2021 Facility, and was in compliance with all covenants contained therein during the six months ended June 30, 2016.

Commercial Paper

Aon Corporation, a wholly-owned subsidiary of Aon plc, has established a U.S. commercial paper program, which provides for commercial paper to be issued in an aggregate principal amount of up to $900 million, and a European multi-currency commercial paper program, which provides for commercial paper to be issued in an aggregate principal amount of up to €300 million. The U.S. commercial paper program is fully and unconditionally guaranteed by Aon plc and the European commercial paper program is fully and unconditionally guaranteed by Aon Corporation. In the aggregate, the Company had $241 million and $50 million of commercial paper outstanding at June 30, 2016 and December 31, 2015, respectively, which is included in Short-term debt and current portion of long-term debt in the Company's Condensed Consolidated Statements of Financial Position. The weighted average commercial paper outstanding for the three and six months ended June 30, 2016, respectively, was $304 million and $240 million. The weighted average interest rate of the commercial paper outstanding for the three and six months ended June 30, 2016 was 0.59% and 0.41%, respectively.

Notes

On March 1, 2016, Aon plc issued $750 million of 3.875% Senior Notes due December 2025. The Company used the proceeds of the issuance for general corporate purposes.

On May 27, 2016, $500 million of 3.125% Senior Notes issued by Aon Corporation matured and were repaid in full.