Fair Value Measurements - Proceeds from the Sale of Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 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	$ 15	$ 16	$ 31	$ 29
Realized gains	0	0	1	0
Realized losses	(2)	(1)	(4)	(2)
Interest and dividend income	$ 3	$ 3	$ 9	$ 8