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Fair Value Measurements - Proceeds from the Sale of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Proceeds from the sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income        
Sale proceeds $ 10 $ 8 $ 16 $ 13
Realized gains 1 0 1 0
Realized losses (1) (1) (2) (1)
Interest and dividend income $ 3 $ 2 $ 6 $ 5