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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Variable Interest Entities and Securitizations [Abstract] |  |
Total collateral balances | $ 1,752 | $ 1,873
Total certificate balances | 1,697 | 1,817
Unconsolidated securitization trusts | $ 242 | $ 285

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