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Debt Obligations (Changes in Debt Obligations) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2016 | Nov. 30, 2014
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 2,364,000,000 |  |
Additions | 2,456,000,000 |  |
Payments, Accretion and Other | (1,217,000,000) |  |
Debt obligations at end of period | 3,603,000,000 |  |
$400 million senior unsecured term loan facility due November 25, 2019 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | 0 |  |
Additions | 399,000,000 |  |
Payments, Accretion and Other | 0 |  |
Debt obligations at end of period | 399,000,000 |  |
Credit facility, borrowing capacity | $ 400,000,000 | $ 400,000,000 |
Interest rate during period | 2.00% |  |
Senior Notes | 5.55% senior unsecured notes due January 15, 2020 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 597,000,000 |  |
Additions | 0 |  |
Payments, Accretion and Other | 1,000,000 |  |
Debt obligations at end of period | $ 598,000,000 |  |
Stated rate | 5.55% |  |
Senior Notes | 5.25% senior unsecured notes due January 16, 2018 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 368,000,000 |  |
Additions | 0 |  |
Payments, Accretion and Other | 1,000,000 |  |
Debt obligations at end of period | $ 369,000,000 |  |
Stated rate | 5.25% |  |
Senior Notes | 3.875% senior unsecured notes due June 7, 2021 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 646,000,000 |  |
Additions | 0 |  |
Payments, Accretion and Other | (21,000,000) |  |
Debt obligations at end of period | $ 625,000,000 |  |
Stated rate | 3.875% |  |
Senior Notes | 4.25% senior unsecured notes due June 1, 2024 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 495,000,000 |  |
Additions | 0 |  |
Payments, Accretion and Other | 0 |  |
Debt obligations at end of period | $ 495,000,000 |  |
Stated rate | 4.25% |  |
Senior Notes | 1.75% senior unsecured notes due May 19, 2023 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 0 |  |
Additions | 664,000,000 |  |
Payments, Accretion and Other | (42,000,000) |  |
Debt obligations at end of period | $ 622,000,000 |  |
Stated rate | 1.75% |  |
Senior Notes | 3.85% senior unsecured notes due June 30, 2026 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 0 |  |
Additions | 495,000,000 |  |
Payments, Accretion and Other | 0 |  |
Debt obligations at end of period | $ 495,000,000 |  |
Stated rate | 3.85% |  |
Revolving Credit Facility | $750 million revolving credit commitment due November 25, 2019 |  |  |
Changes in Debt Obligations [Roll Forward] |  |  |
Debt obligations at beginning of period | $ 258,000,000 |  |
Additions | 898,000,000 |  |
Payments, Accretion and Other | (1,156,000,000) |  |
Debt obligations at end of period | 0 |  |
Credit facility, borrowing capacity | $ 750,000,000 |  | $ 750,000,000
Interest rate during period | 1.63% |  |

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