CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 543	$ 503	$ 1,430	$ 1,559
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(22)	(3)	(31)	(18)
Net unrealized gains (losses) on securities	90	(62)	660	(454)
Net unrealized gains (losses) on derivatives	0	0	(1)	0
Total other comprehensive income (loss), net of tax	68	(65)	628	(472)
Total comprehensive income	$ 611	$ 438	$ 2,058	$ 1,087