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Indebtedness - Summary of Other Non-Recourse Debt (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Other nonrecourse debt principal amount | $ 4,221 | $ 4,424
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% |
Nonrecourse debt–legacy assets |  |
Debt Instrument [Line Items] |  |
Other nonrecourse debt principal amount | $ 4,221 | 4,424
Unamortized premium, net of debt issuance costs and discount | 9 | 8
Nonrecourse debt–legacy assets | Participating interest financing |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 0 |
Other nonrecourse debt principal amount | 3,306 | 3,473
Nonrecourse debt–legacy assets | Trust 2020-1 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 489 |
Other nonrecourse debt principal amount | 471 | 490
Nonrecourse debt–legacy assets | Trust 2019-2 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 254 |
Other nonrecourse debt principal amount | 232 | 241
Nonrecourse debt–legacy assets | Trust 2019-1 |  |
Debt Instrument [Line Items] |  |
Collateral Amount | 231 |
Other nonrecourse debt principal amount | 203 | 212
Nonrecourse debt–legacy assets | Other nonrecourse debt |  |
Debt Instrument [Line Items] |  |
Other nonrecourse debt principal amount | $ 4,212 | $ 4,416

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