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Fair Value Measurements - Proceeds from the Sale of Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
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	$ 6	$ 204	$ 45	$ 506
Realized gains	0	8	4	20
Realized Losses	0	(7)	(7)	(18)
Interest and dividend income	$ 4	$ 10	$ 18	$ 30