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Debt (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Debt Disclosure [Abstract] |
Schedule of debt |
(in millions) | March 31, 2015 |  | December 31, 2014
5.9% Senior Notes, due 2017 1 | $ | 400 |  |  | $ | 400 |
6.55% Senior Notes, due 2037 2 | 399 |  |  | 399 |
Commercial paper | 190 |  |  | — |
Revolving line of credit | 175 |  |  | — |
Total debt | 1,164 |  |  | 799 |
Less: short-term debt including current maturities | 365 |  |  | — |
Long-term debt | $ | 799 |  |  | $ | 799 |
1 | Interest payments are due semiannually on April 15 and October 15, and, as of March 31, 2015, the unamortized debt discount is less than $1 million.
2 | Interest payments are due semiannually on May 15 and November 15, and, as of March 31, 2015, 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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