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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances - UPB | $ 798 | $ 881
Total certificate balances | 773 | 849
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Unconsolidated securitization trusts | $ 81 | $ 91

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