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Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt | Debt consists of (in millions):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Senior Notes, interest at 5.65% payable semiannually, principal due on November 15, 2012 |  | $ | — |  |  | $ | 200 |
Senior Notes, interest at 5.5% payable semiannually, principal due on November 19, 2012 |  |  | — |  |  |  | 150 |
Senior Notes, interest at 6.125% payable semiannually, principal due on August 15, 2015 |  |  | 151 |  |  |  | 151 |
Senior Notes, interest at 1.35% payable semiannually, principal due on December 1, 2017 |  |  | 500 |  |  |  | — |
Senior Notes, interest at 2.6% payable semiannually, principal due on December 1, 2022 |  |  | 1,395 |  |  |  | — |
Senior Notes, interest at 3.95% payable semiannually, principal due on December 1, 2042 |  |  | 1,096 |  |  |  | — |
Other |  |  | 7 |  |  |  | 9 |
Total debt |  |  | 3,149 |  |  |  | 510 |
Less current portion |  |  | 1 |  |  |  | 351 |
Long-term debt |  | $ | 3,148 |  |  | $ | 159 |
Principal payments of debt | Principal payments of debt for years subsequent to 2012 are as follows (in millions):
2013 |  | $ | 1 |
2014 |  |  | 3 |
2015 |  |  | 151 |
2016 |  |  | — |
2017 |  |  | 500 |
Thereafter |  |  | 2,494 |
|  | $ | 3,149 |

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