Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Reconciles Beginning and Ending Balances Level 3 Residual Assets Fair Value Recurring Basis (Details) (Details) - Securitization residual assets - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 122 $ 71
Accretion of securitization residual assets 1 1
Purchases of investments 12 6
Payments on investments (1) (1)
Sale of investments (21) 0
Unrealized gains (losses) on investments recorded in OCI 5 0
Balance, end of period $ 118 $ 77