UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 769	$ 801	$ 547	$ 224
Other comprehensive (loss) income, net of tax
Foreign currency translation adjustments, net of tax	(30)	42	(52)	(3)
Net unrealized gains (losses) on available-for-sale securities	1	(5)	98	(2)
Total other comprehensive (loss) income, net of tax	(29)	37	46	(5)
Comprehensive income	$ 740	$ 838	$ 593	$ 219