Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 5,855	$ 3,299	$ 3,704
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss)	(8,521)	6,961	430
Other reclassifications included in other revenue	(4)	(4)	(6)
Change in net unrealized gain (loss) on held to maturity securities:
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale	0	0	36
Other	(11)	8	(14)
Other comprehensive income (loss), before tax	(8,536)	6,965	446
Income tax effect	2,033	(1,659)	(106)
Other comprehensive income (loss), net of tax	(6,503)	5,306	340
Comprehensive Income (Loss)	$ (648)	$ 8,605	$ 4,044