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Debt and Capital Leases - Recourse Debt Issuances/Repurchases (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 07, 2017 | Aug. 02, 2016 | May 23, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument |  |  |  |  |  |
Loss on debt extinguishment |  |  |  | $ 53 | $ 142 | $ (10)
Senior notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Accrued interest |  |  |  |  | 77 |
Loss on debt extinguishment |  |  |  |  | 117 |
Deferred financing costs |  |  |  |  | $ 16 |
Recourse Debt | Senior Notes due 2028 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Proceeds from issuance of senior notes | $ 870 |  |  |  |  |
Interest rate, stated percentage | 5.75% |  |  | 5.75% |  |
Recourse Debt | Senior Notes due 2026 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Proceeds from issuance of senior notes |  |  | $ 1,000 |  |  |
Interest rate, stated percentage |  |  | 7.25% | 7.25% |  |
Recourse Debt | Senior Notes due 2027 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Proceeds from issuance of senior notes |  | $ 1,250 |  |  |  |
Interest rate, stated percentage |  | 6.625% |  | 6.625% |  |
Recourse Debt | Senior notes, due 2020 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest rate, stated percentage |  | 8.25% |  |  | 8.25% |
Principal Repurchased |  |  |  |  | $ 1,058 |
Cash Paid |  |  |  |  | $ 1,129 |
Average Early Redemption Percentage |  |  |  |  | 103.12% |
Recourse Debt | Senior notes, due 2018 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 7.625% | 7.625% |
Principal Repurchased |  |  |  | $ 398 | $ 641 |
Cash Paid |  |  |  | $ 411 | $ 706 |
Average Early Redemption Percentage |  |  |  | 101.42% | 107.89% |
Redemptions by cash |  |  |  | $ 186 |  |
Recourse Debt | Senior notes, due 2021 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest rate, stated percentage |  | 7.875% |  | 7.875% | 7.875% |
Principal Repurchased |  |  |  | $ 206 | $ 922 |
Cash Paid |  |  |  | $ 218 | $ 978 |
Average Early Redemption Percentage |  |  |  | 102.63% | 104.00% |
Redemptions by cash |  |  |  | $ 193 |  |
Recourse Debt | Senior notes, due 2023 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest rate, stated percentage | 6.625% |  |  | 6.625% | 6.625% |
Principal Repurchased |  |  |  | $ 869 | $ 67 |
Cash Paid |  |  |  | $ 915 | $ 64 |
Average Early Redemption Percentage |  |  |  | 103.57% | 94.13% |
Recourse Debt | Senior notes, due 2022 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.25% | 6.25% |
Principal Repurchased |  |  |  |  | $ 108 |
Cash Paid |  |  |  |  | $ 105 |
Average Early Redemption Percentage |  |  |  | 35.00% | 94.73% |
Recourse Debt | Senior notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Principal amount redeemed |  |  |  | $ 1,500 |  |
Principal Repurchased |  |  |  | 1,473 | $ 2,967 |
Cash Paid |  |  |  | $ 1,544 | $ 3,145 |
Average Early Redemption Percentage |  |  |  | 25.00% |  |
Accrued interest |  |  |  | $ 29 |  |
Loss on debt extinguishment |  |  |  | 49 |  |
Write off of deferred debt issuance cost |  |  |  | $ 7 |  |
Recourse Debt | Senior Notes 2024 |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.25% | 6.25% |
Principal Repurchased |  |  |  |  | $ 171 |
Cash Paid |  |  |  |  | $ 163 |
Average Early Redemption Percentage |  |  |  | 35.00% | 94.52% |

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