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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances - UPB | $ 925 | $ 976
Total certificate balances | 901 | 949
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Unconsolidated securitization trusts | $ 99 | $ 119

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