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) - Debt securities - Level 3 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 17 $ 26 $ 18 $ 55
Purchases of investments 2 0 2 5
Sale of investments (7) (10) (7) (38)
Realized gains on investments recorded in gain on sale of receivables and investments 0 1 0 0
Unrealized gains (losses) on investments recorded in OCI 0 1 (1) (4)
Balance, end of period $ 12 $ 18 $ 12 $ 18