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Debt (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2016
Debt Disclosure [Abstract] |
Schedule of debt |
(in millions) | March 31, 2016 |  | December 31, 2015
5.9% Senior Notes, due 2017 1 | $ | 400 |  |  | 399 |
2.5% Senior Notes, due 2018 2 | 398 |  |  | 398 |
3.3% Senior Notes, due 2020 3 | 695 |  |  | 695 |
4.0% Senior Notes, due 2025 4 | 690 |  |  | 690 |
4.4% Senior Notes, due 2026 5 | 890 |  |  | 890 |
6.55% Senior Notes, due 2037 6 | 396 |  |  | 396 |
Commercial paper | 322 |  |  | 143 |
Revolving line of credit | 150 |  |  | — |
Total debt | 3,941 |  |  | 3,611 |
Less: short-term debt including current maturities | 472 |  |  | 143 |
Long-term debt | $ | 3,469 |  |  | $ | 3,468 |
1 | Interest payments are due semiannually on April 15 and October 15, and as of March 31, 2016, the unamortized debt discount and issuance costs are less than $1 million.
2 | Interest payments are due semiannually on February 15 and August 15, and as of March 31, 2016, the unamortized debt discount and issuance costs total $2 million.
3 | Interest payments are due semiannually on February 14 and August 14, and as of March 31, 2016, the unamortized debt discount and issuance costs total $5 million.
4 | Interest payments are due semiannually on June 15 and December 15, and as of March 31, 2016, the unamortized debt discount and issuance costs total $10 million.
5 | Interest payments are due semiannually on February 15 and August 15, and as of March 31, 2016, the unamortized debt discount and issuance costs total $10 million.
6 | Interest payments are due semiannually on May 15 and November 15, and as of March 31, 2016, the unamortized debt discount and issuance costs total $4 million.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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