CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ (539)	$ 492	$ 1,497	$ 887
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(8)	(14)	(41)	(9)
Net unrealized gains (losses) on securities	697	248	173	570
Net unrealized gains (losses) on derivatives		0	0	(1)
Total other comprehensive income (loss), net of tax	689	234	132	560
Total comprehensive income	$ 150	$ 726	$ 1,629	$ 1,447