CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ (140)	$ 543	$ 1,357	$ 1,430
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	27	(22)	(14)	(31)
Net unrealized gains (losses) on securities	95	90	268	660
Net unrealized gains (losses) on derivatives			0	(1)
Total other comprehensive income (loss), net of tax	122	68	254	628
Total comprehensive income (loss)	$ (18)	$ 611	$ 1,611	$ 2,058