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Debt Obligations (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Changes in Debt Obligations | The following table presents the changes in the carrying amount of our debt obligations during the year ended December 31, 2016:
| December 31, 2015 |  | Additions |  | Payments, Accretion and Other |  | December 31, 2016
| (in millions)
5.55% senior unsecured notes due January 15, 2020 | $ | 597 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 598 |
5.25% senior unsecured notes due January 16, 2018 | 368 |  |  | — |  |  | 1 |  |  | 369 |
3.875% senior unsecured notes due June 7, 2021 | 646 |  |  | — |  |  | (21 | ) |  | 625 |
4.25% senior unsecured notes due June 1, 2024 | 495 |  |  | — |  |  | — |  |  | 495 |
1.75% senior unsecured notes due May 19, 2023 | — |  |  | 664 |  |  | (42 | ) |  | 622 |
3.85% senior unsecured notes due June 30, 2026 | — |  |  | 495 |  |  | — |  |  | 495 |
$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 2.00% for the period March 17, 2016 through December 31, 2016) | — |  |  | 399 |  |  | — |  |  | 399 |
$750 million revolving credit commitment due November 25, 2019 (average interest rate of 1.63% for the period January 1, 2016 through December 31, 2016) | 258 |  |  | 898 |  |  | (1,156 | ) |  | — |
Total long-term debt obligations | $ | 2,364 |  |  | $ | 2,456 |  |  | $ | (1,217 | ) |  | $ | 3,603 |

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