Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 795	$ 964
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss)	5,151	227
Other reclassifications included in other revenue	0	(1)
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale	0	12
Other comprehensive income (loss), before tax	5,151	238
Income tax effect	(1,244)	(57)
Other comprehensive income (loss), net of tax	3,907	181
Comprehensive Income	$ 4,702	$ 1,145