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Indebtedness - Summary of Other Non-Recourse Debt (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Other nonrecourse debt principal amount | $ 4,671 | $ 5,286
Participating interest financing | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.30% |
Participating interest financing | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.60% |
Trust 2020-1 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.30% |
Trust 2020-1 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 7.50% |
Trust 2019-2 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.30% |
Trust 2019-2 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.00% |
Trust 2019-1 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.70% |
Trust 2019-1 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.00% |
Trust 2018-3 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.60% |
Trust 2018-3 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.00% |
Trust 2018-2 | Minimum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.20% |
Trust 2018-2 | Maximum |  |
Debt Instrument [Line Items] |  |
Interest Rate | 6.00% |
Nonrecourse debt–legacy assets |  |
Debt Instrument [Line Items] |  |
Other nonrecourse debt principal amount | $ 4,671 | 5,286
Unamortized debt issuance costs, premium and discount | 6 | 10
Nonrecourse debt–legacy assets | Participating interest financing |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Other nonrecourse debt principal amount | 3,664 | 4,284
Nonrecourse debt–legacy assets | Trust 2020-1 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 519 |
Other nonrecourse debt principal amount | 516 | 0
Nonrecourse debt–legacy assets | Trust 2019-2 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 275 |
Other nonrecourse debt principal amount | 259 | 333
Nonrecourse debt–legacy assets | Trust 2019-1 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 248 |
Other nonrecourse debt principal amount | 226 | 302
Nonrecourse debt–legacy assets | Trust 2018-3 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Other nonrecourse debt principal amount | 0 | 209
Nonrecourse debt–legacy assets | Trust 2018-2 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Other nonrecourse debt principal amount | 0 | 148
Nonrecourse debt–legacy assets | Other |  |
Debt Instrument [Line Items] |  |
Other nonrecourse debt principal amount | $ 4,665 | $ 5,276

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