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Debt and Finance Leases - Senior Notes Redemption and Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 07, 2017 | Aug. 02, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  | $ 51 | $ 44 | $ 49 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  | 38 |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  | 7 |  |  |  |  |
Recourse Debt | Senior Notes, due 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount redeemed |  |  |  | $ 733 |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.25% |  |  |  |  |  |
Loss on debt extinguishment |  |  |  | $ 29 |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  | $ 5 |  |  |  |  |  |
Recourse Debt | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal Repurchased |  |  | $ 1,061 |  | 1,061 |  | $ 576 | $ 43 |  |
Cash Paid |  |  | 1,106 |  | 1,106 |  | $ 598 | $ 45 |  |
Redemption percentage of principal |  |  |  | 25.00% |  |  |  |  |  |
Accrued interest |  |  | 14 |  | 14 |  |  |  |  |
Recourse Debt | Senior Notes, due 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.75% |  |  | 5.75% | 5.75% | 5.75% |
Principal Repurchased |  |  |  |  |  |  | $ 20 | $ 29 |  |
Cash Paid |  |  |  |  |  |  | $ 20 | $ 30 |  |
Redemption percentage of principal | 99.13% | 99.24% |  |  |  |  |  |  |  |
Recourse Debt | Senior Notes Due In 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.25% |  |  | 6.25% | 6.25% |  |
Principal Repurchased |  |  | 485 |  | 485 |  | $ 493 | $ 14 |  |
Cash Paid |  |  | $ 508 |  | $ 508 |  | $ 512 | $ 15 |  |
Redemption percentage of principal | 103.13% | 103.25% | 103.13% |  |  |  |  |  |  |
Recourse Debt | Senior Notes, due 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.625% |  |  | 6.625% |  |  | 6.625%
Principal Repurchased |  |  |  |  |  |  | $ 20 |  |  |
Cash Paid |  |  |  |  |  |  | $ 21 |  |  |
Redemption percentage of principal | 103.06% |  |  |  |  |  |  |  |  |

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