Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Reconciles Beginning and Ending Balances Level 3 Residual Assets Fair Value Recurring Basis (Details)

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Fair Value Measurements - Reconciles Beginning and Ending Balances Level 3 Residual Assets Fair Value Recurring Basis (Details) - Securitization residual assets - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 71 $ 45
Accretion of securitization residual assets 4 3
Additions to securitization residual assets 59 25
Collections of securitization residual assets (7) (3)
Sales of securitization residual assets (13) 0
Unrealized gains (losses) on securitization residual assets recorded in OCI 8 1
Balance, end of period $ 122 $ 71