Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Schedule of Level 3 Investments at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 18 $ 55
Additions to securitization residual assets 0 5
Sale of investments 0 (29)
Unrealized gains (losses) on securitization residual assets recorded in OCI (2) (5)
Balance, end of period 16 26
Securitization residual assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 210 159
Accretion of securitization residual assets 2 2
Additions to securitization residual assets 5 15
Collections of securitization residual assets (3) (1)
Unrealized gains (losses) on securitization residual assets recorded in OCI (22) (15)
Balance, end of period $ 192 $ 160