Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 671	$ 937	$ 1,466	$ 1,901
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss)	2,113	218	7,264	445
Other reclassifications included in other revenue	0	(3)	0	(4)
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale	0	8	0	20
Other	1	0	1	0
Other comprehensive income (loss), before tax	2,114	223	7,265	461
Income tax effect	(498)	(53)	(1,742)	(110)
Other comprehensive income (loss), net of tax	1,616	170	5,523	351
Comprehensive Income	$ 2,287	$ 1,107	$ 6,989	$ 2,252