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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances - UPB | $ 1,422 | $ 1,503
Total certificate balances | 1,421 | 1,512
Unconsolidated securitization trusts | $ 239 | $ 193

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