Condensed 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	$ 698	$ 951	$ 2,164	$ 2,852
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss)	97	51	7,361	496
Other reclassifications included in other revenue	(3)	(1)	(3)	(5)
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale	0	10	0	30
Other	0	0	1	0
Other comprehensive income (loss), before tax	94	60	7,359	521
Income tax effect	(19)	(15)	(1,761)	(125)
Other comprehensive income (loss), net of tax	75	45	5,598	396
Comprehensive Income	$ 773	$ 996	$ 7,762	$ 3,248