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Securitizations and Financings - Securitization Trusts (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total collateral balances | $ 1,940 |
Total certificate balances | 1,884 |
Unconsolidated securitization trusts | $ 317 |
Predecessor |  |
Variable Interest Entity [Line Items] |  |
Total collateral balances |  | $ 2,291
Total certificate balances |  | 2,129
Unconsolidated securitization trusts |  | $ 448

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