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Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Debt | Debt consists of (in millions):
|  | December 31, |
|  | 2015 |  |  | 2014 |
Senior Notes, interest at 6.125% payable semiannually, principal due on August 15, 2015 |  |  | — |  |  |  | 151 |
Senior Notes, interest at 1.35% payable semiannually, principal due on December 1, 2017 |  |  | 500 |  |  |  | 500 |
Senior Notes, interest at 2.6% payable semiannually, principal due on December 1, 2022 |  |  | 1,396 |  |  |  | 1,396 |
Senior Notes, interest at 3.95% payable semiannually, principal due on December 1, 2042 |  |  | 1,096 |  |  |  | 1,096 |
Commercial paper |  |  | 893 |  |  |  | — |
Other |  |  | 45 |  |  |  | 23 |
Total debt |  |  | 3,930 |  |  |  | 3,166 |
Less current portion |  |  | 2 |  |  |  | 152 |
Long-term debt |  | $ | 3,928 |  |  | $ | 3,014 |
Principal Payments of Debt | Principal payments of debt for years subsequent to 2015 are as follows (in millions):
2016 |  | $ | 2 |
2017 |  |  | 506 |
2018 |  |  | 898 |
2019 |  |  | 5 |
2020 |  |  | 5 |
Thereafter |  |  | 2,514 |
|  | $ | 3,930 |

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