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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances - UPB | $ 1,230 | $ 1,326
Total certificate balances | 1,229 | 1,329
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Unconsolidated securitization trusts | $ 141 | $ 154

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