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Indebtedness - Summary of Other Non-Recourse Debt (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Non-recourse debt | $ 7,165 |
Unamortized debt issuance costs, net of premium, and issuance discount(2) | 82 |
Participating Interest Financing |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 6,021 |
Trust 2016-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 0 |
Trust 2016-3 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 0 |
Trust 2017-1 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 151 |
Trust 2017-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 258 |
Trust 2018-1 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 329 |
Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 292 |
Legacy Asset |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 32 |
Other |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 7,083 |
Nonrecourse debt–legacy assets | Participating Interest Financing |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 0 |
Nonrecourse debt–legacy assets | Trust 2016-2 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 0 |
Nonrecourse debt–legacy assets | Trust 2016-3 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 0 |
Nonrecourse debt–legacy assets | Trust 2017-1 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 193 |
Nonrecourse debt–legacy assets | Trust 2017-2 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 308 |
Nonrecourse debt–legacy assets | Trust 2018-1 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 348 |
Nonrecourse debt–legacy assets | Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 298 |
Nonrecourse debt–legacy assets | Legacy Asset |  |
Debt Instrument [Line Items] |  |
Securitized Amount | $ 112 |
Predecessor |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | $ 8,014
Unamortized debt issuance costs, net of premium, and issuance discount(2) |  | 51
Debt premium |  | 62
Predecessor | Participating Interest Financing |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 7,111
Predecessor | Trust 2016-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 94
Predecessor | Trust 2016-3 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 138
Predecessor | Trust 2017-1 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 213
Predecessor | Trust 2017-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 365
Predecessor | Trust 2018-1 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 0
Predecessor | Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 0
Predecessor | Legacy Asset |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | 42
Predecessor | Other |  |
Debt Instrument [Line Items] |  |
Non-recourse debt |  | $ 7,963

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