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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances - UPB | $ 1,283 | $ 1,326
Total certificate balances | 1,281 | 1,329
Unconsolidated securitization trusts | $ 147 | $ 154

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