Condensed 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
Statement of Comprehensive Income [Abstract]
Net income	$ 1,526	$ 698	$ 4,275	$ 2,164
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss)	(1,519)	97	(5,420)	7,361
Other reclassifications included in other revenue	0	(3)	(14)	(3)
Other	0	0	0	1
Other comprehensive income (loss), before tax	(1,519)	94	(5,434)	7,359
Income tax effect	364	(19)	1,293	(1,761)
Other comprehensive income (loss), net of tax	(1,155)	75	(4,141)	5,598
Comprehensive Income (Loss)	$ 371	$ 773	$ 134	$ 7,762