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Debt and Capital Leases - Senior Note Redemptions (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 07, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on debt extinguishment | $ 44 | $ 49 | $ 142 |  |  |
Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on debt extinguishment | 38 |  |  |  |  |
Write off of deferred debt issuance cost | 7 |  |  |  |  |
Recourse Debt | Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount redeemed |  | 1,500 |  |  |  |
Loss on debt extinguishment |  | 49 |  |  |  |
Write off of deferred debt issuance cost |  | 7 |  |  |  |
Principal Repurchased | 1,061 | 1,473 |  | $ 576 | $ 43 |
Cash Paid | $ 1,106 | 1,544 |  | $ 598 | $ 45 |
Average Early Redemption Percentage | 25.00% |  |  |  |  |
Accrued interest |  | $ 29 |  |  |  |
Recourse Debt | Senior notes, due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  | 7.625% |  |  |  |
Principal Repurchased |  | $ 398 |  |  |  |
Cash Paid |  | $ 411 |  |  |  |
Average Early Redemption Percentage |  | 101.42% |  |  |  |
Recourse Debt | Senior notes, due 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  | 7.875% |  |  |  |
Principal Repurchased |  | $ 206 |  |  |  |
Cash Paid |  | $ 218 |  |  |  |
Average Early Redemption Percentage |  | 102.63% |  |  |  |
Recourse Debt | Senior notes, due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  | 6.625% |  |  |  | 6.625%
Principal Repurchased |  | $ 869 |  |  |  |
Cash Paid |  | $ 915 |  |  |  |
Average Early Redemption Percentage |  | 103.57% |  |  |  |

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