Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Level??3 Investments at Fair Value (Details)

v3.21.1
Fair Value Measurements - Schedule of Level 3 Investments at Fair Value (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 55 $ 75
Purchases of investments 5 16
Principal payments on investments 0 (1)
Sale of investments (29) (33)
Realized gains on investments recorded in gain on sale of receivables and investments 0 3
Unrealized gains (losses) on investments recorded in OCI (5) 3
Balance, end of period 26 63
Securitization residual assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 159 122
Accretion of securitization residual assets 2 1
Purchases of investments 15 12
Principal payments on investments (1) (1)
Sale of investments 0 (21)
Unrealized gains (losses) on investments recorded in OCI (15) 5
Balance, end of period $ 160 $ 118