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Indebtedness - Summary of Other Non-Recourse Debt (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Non-recourse debt | $ 5,985,000,000 | $ 6,795,000,000
Unamortized debt issuance costs, premium, and issuance discount | 26,000,000 | 68,000,000
Participating Interest Financing |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 4,861,000,000 | 5,607,000,000
Trust 2017-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 0 | 231,000,000
Trust 2018-1 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 224,000,000 | 284,000,000
Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 182,000,000 | 250,000,000
Trust 2018-3 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 272,000,000 | 326,000,000
Trust 2019-1 |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 398,000,000 | 0
Legacy Asset |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 22,000,000 | 29,000,000
Other |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | 5,959,000,000 | $ 6,727,000,000
Nonrecourse debt–legacy assets | Participating Interest Financing |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 0 |
Nonrecourse debt–legacy assets | Trust 2017-2 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 0 |
Nonrecourse debt–legacy assets | Trust 2018-1 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 252,000,000 |
Nonrecourse debt–legacy assets | Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 198,000,000 |
Nonrecourse debt–legacy assets | Trust 2018-3 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 284,000,000 |
Nonrecourse debt–legacy assets | Trust 2019-1 |  |
Debt Instrument [Line Items] |  |
Securitized Amount | 398,000,000 |
Nonrecourse debt–legacy assets | Legacy Asset |  |
Debt Instrument [Line Items] |  |
Securitized Amount | $ 97,000,000 |

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