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Indebtedness - Non Recourse Debt (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Non-recourse debt | $ 5,286,000,000 | $ 6,795,000,000
Unamortized debt issuance costs, premium and discount | 10,000,000 | 68,000,000
Participating interest financing |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Non-recourse debt | 4,284,000,000 | 5,607,000,000
Trust 2019-2 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 337,000,000 |
Non-recourse debt | 333,000,000 | 0
Trust 2019-1 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 315,000,000 |
Non-recourse debt | 302,000,000 | 0
Trust 2018-3 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 226,000,000 |
Non-recourse debt | 209,000,000 | 326,000,000
Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 168,000,000 |
Non-recourse debt | 148,000,000 | 250,000,000
Trust 2018-1 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Non-recourse debt | 0 | 284,000,000
Trust 2017-2 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Non-recourse debt | 0 | 231,000,000
Legacy Asset |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Non-recourse debt | 0 | 29,000,000
Other |  |
Debt Instrument [Line Items] |  |
Non-recourse debt | $ 5,276,000,000 | $ 6,727,000,000

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