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Debt | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Debt | Debt The following is a summary of outstanding debt (in millions):
As of December 31 | 2016 |  | 2015 (1)
3.875% Senior Notes due December 2025 | $ | 744 |  |  | $ | — |
5.00% Senior Notes due September 2020 | 598 |  |  | 597 |
4.75% Senior Notes due May 2045 | 592 |  |  | 591 |
3.50% Senior Notes due June 2024 | 594 |  |  | 593 |
4.60% Senior Notes due June 2044 | 543 |  |  | 543 |
2.875% Senior Notes due May 2026 (EUR 500M) | 516 |  |  | 541 |
8.205% Junior Subordinated Notes due January 2027 | 521 |  |  | 521 |
3.125% Senior Notes due May 2016 | — |  |  | 500 |
2.80% Senior Notes due March 2021 | 397 |  |  | 396 |
4.00% Senior Notes due November 2023 | 347 |  |  | 347 |
6.25% Senior Notes due September 2040 | 295 |  |  | 295 |
4.76% Senior Notes due March 2018 (CAD 375M) | 277 |  |  | 270 |
4.45% Senior Notes due May 2043 | 246 |  |  | 246 |
4.25% Senior Notes due December 2042 | 197 |  |  | 195 |
Commercial paper | 329 |  |  | 50 |
Other | 9 |  |  | 15 |
Total debt | 6,205 |  |  | 5,700 |
Less short-term and current portion of long-term debt | 336 |  |  | 562 |
Total long-term debt | $ | 5,869 |  |  | $ | 5,138 |
(1) Amended to reflect the adoption of new guidance related to the presentation of debt issuance costs as described in Note 2 “Summary of Significant Accounting Principles and Practices.” On May 27, 2016, $500 million of 3.125% Senior Notes due May 2016 issued by Aon Corporation matured and were repaid in full. 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 November 13, 2015, Aon plc issued $400 million of 2.80% Senior Notes due March 2021. The Company used the proceeds of the issuance for general corporate purposes. On September 30, 2015, $600 million of 3.50% Senior Notes issued by Aon Corporation matured and were repaid in full. On May 20, 2015, Aon plc issued $600 million of 4.750% Senior Notes due May 2045. The Company used the proceeds of the issuance for general corporate purposes. Each of the notes issued by Aon plc and described above is fully and unconditionally guaranteed by Aon Corporation. The 4.76% Senior Notes due March 2018 identified in the table above were issued by a Canadian subsidiary of Aon Corporation and are fully and unconditionally guaranteed by Aon plc and Aon Corporation. Refer to Note 16 “Guarantee of Registered Securities” for additional information regarding guarantees of outstanding debt securities. Each of the notes described above and identified in the table above contains customary representations, warranties and covenants, and the Company was in compliance with all such covenants as of December 31, 2016. Repayments of total debt are as follows (in millions):
2017 | $ | 336 |
2018 | 278 |
2019 | — |
2020 | 600 |
2021 | 400 |
Thereafter | 4,700 |
Total Repayments | 6,314 |
Unamortized discount, premium, and debt issuance cost | (109 | )
Total Debt | $ | 6,205 |
Revolving Credit Facilities As of December 31, 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”). The Company plans to let the 2017 facility expire but may evaluate obtaining additional committed credit in the future. 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 December 31, 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 twelve months ended December 31, 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 Aon plc has established a European multi-currency commercial paper program that 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 $329.2 million and $50.0 million of commercial paper outstanding at December 31, 2016 and 2015, respectively, which was included in Short-term debt and current portion of long-term debt in the Company’s Consolidated Statements of Financial Position. The weighted average commercial paper outstanding for 2016 and 2015 was $265.0 million and $402.0 million, respectively. The weighted average interest rate of the commercial paper outstanding during 2016 and 2015 was 0.22% and 0.50%, respectively.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 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 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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