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Securitizations and Financings - Securitization Trusts (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Total collateral balances $ 1,873  
Total certificate balances 1,817  
Unconsolidated securitization trusts $ 285  
Predecessor    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Total collateral balances   $ 2,291
Total certificate balances   2,129
Unconsolidated securitization trusts   $ 448