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Debt | 6 Months Ended
--- | ---
Jun. 30, 2017
Debt Disclosure [Abstract] |
Debt | Debt
(in millions) | June 30, 2017 |  | December 31, 2016
2.5% Senior Notes, due 2018 1 | $ | 399 |  |  | $ | 398 |
3.3% Senior Notes, due 2020 2 | 696 |  |  | 696 |
4.0% Senior Notes, due 2025 3 | 691 |  |  | 691 |
4.4% Senior Notes, due 2026 4 | 892 |  |  | 891 |
2.95% Senior Notes, due 2027 5 | 492 |  |  | 492 |
6.55% Senior Notes, due 2037 6 | 396 |  |  | 396 |
Commercial paper | — |  |  | — |
Total debt | 3,566 |  |  | 3,564 |
Less: short-term debt including current maturities | — |  |  | — |
Long-term debt | $ | 3,566 |  |  | $ | 3,564 |
1 | Interest payments are due semiannually on February 15 and August 15, and as of June 30, 2017, the unamortized debt discount and issuance costs total $1 million.
2 | Interest payments are due semiannually on February 14 and August 14, and as of June 30, 2017, the unamortized debt discount and issuance costs total $4 million.
3 | Interest payments are due semiannually on June 15 and December 15, and as of June 30, 2017, the unamortized debt discount and issuance costs total $9 million.
4 | Interest payments are due semiannually on February 15 and August 15, and as of June 30, 2017, the unamortized debt discount and issuance costs total $8 million.
5 | Interest payments are due semiannually on January 22 and July 22, and as of June 30, 2017, the unamortized debt discount and issuance costs total $8 million.
6 | Interest payments are due semiannually on May 15 and November 15, and as of June 30, 2017, the unamortized debt discount and issuance costs total $4 million.
The fair value of our long-term debt borrowings was $3.8 billion and $3.7 billion as of June 30, 2017 and December 31, 2016, respectively, and was estimated based on quoted market prices. On June 30, 2017, we entered into a revolving $1.2 billion five-year credit agreement (our "credit facility") that will terminate on June 30, 2022. This credit facility replaced our $1.2 billion five year credit facility that was scheduled to terminate on June 30, 2020. The previous credit facility was canceled immediately after the new credit facility became effective. There were no outstanding borrowings under the previous credit facility when it was replaced. We have the ability to borrow a total of $1.2 billion through our commercial paper program, which is supported by our credit facility. As of June 30, 2017 and December 31, 2016, there were no commercial paper borrowings outstanding. Depending on our indebtedness to cash flow ratio, we pay a commitment fee of 8 to 17.5 basis points for our credit facility, whether or not amounts have been borrowed. We currently pay a commitment fee of 12.5 basis points. The interest rate on borrowings under our credit facility is, at our option, calculated using rates that are primarily based on either the prevailing London Inter-Bank Offer Rate, the prime rate determined by the administrative agent or the Federal Funds Rate. For certain borrowings under this credit facility, there is also a spread based on our indebtedness to cash flow ratio added to the applicable rate. Our credit facility contains certain covenants. The only financial covenant requires that our indebtedness to cash flow ratio, as defined in our credit facility, is not greater than 4 to 1, and this covenant level has never been exceeded.

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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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