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Debt (Tables) | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Schedule of 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.

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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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