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Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt Disclosure [Abstract] |
Short-term and long-term debt outstanding | A summary of short-term and long-term debt outstanding is as follows:
(in millions) | December 31,
| 2012 |  | 2011
5.375% Senior Notes, due 2012 | $ | — |  |  | $ | 400 |
5.9% Senior Notes, due 2017 1 | 400 |  |  | 399 |
6.55% Senior Notes, due 2037 2 | 399 |  |  | 399 |
Commercial paper | 457 |  |  | — |
Total debt | 1,256 |  |  | 1,198 |
Less: short-term debt including current maturities | 457 |  |  | 400 |
Long-term debt | $ | 799 |  |  | $ | 798 |
1 | Interest payments are due semiannually on April 15 and October 15, and as of December 31, 2012, the unamortized debt discount is $0.5 million.
2 | Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2012, the unamortized debt discount is $1.3 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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