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Debt (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Debt Disclosure [Abstract] |  |
Short-term and long-term debt outstanding |
(in millions) | June 30, 2015 |  | December 31, 2014
5.9% Senior Notes, due 2017 1 | $ | 400 |  |  | $ | 400 |
4.0% Senior Notes, due 2025 2 | 695 |  |  | — |
6.55% Senior Notes, due 2037 3 | 399 |  |  | 399 |
Long-term debt | $ | 1,494 |  |  | $ | 799 |
1 | Interest payments are due semiannually on April 15 and October 15, and, as of June 30, 2015, the unamortized debt discount is less than $1 million.
2 | Interest payments are due semiannually on June 15 and December 15, and, as of June 30, 2015, the unamortized debt discount is approximately $5 million.
3 | Interest payments are due semiannually on May 15 and November 15, and, as of June 30, 2015, the unamortized debt discount is approximately $1 million.
| A summary of short-term and long-term debt outstanding is as follows:
(in millions) | December 31,
| 2014 |  | 2013
5.9% Senior Notes, due 2017 1 | $ | 400 |  |  | $ | 400 |
6.55% Senior Notes, due 2037 2 | 399 |  |  | 399 |
Commercial paper | — |  |  | — |
Total debt | 799 |  |  | 799 |
Less: short-term debt including current maturities | — |  |  | — |
Long-term debt | $ | 799 |  |  | $ | 799 |
1 | Interest payments are due semiannually on April 15 and October 15, and as of December 31, 2014, the unamortized debt discount is less than $1 million.
2 | Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2014, the unamortized debt discount is approximately $1 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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