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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
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	$ 8	$ 26	$ 13	$ 39
Realized gains	0	0	0	4
Realized Losses	(1)	(2)	(1)	(7)
Interest and dividend income	$ 2	$ 9	$ 5	$ 14