Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	[1]	$ 5,067	$ 7,183	$ 5,855
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss) excluding transfers to held to maturity		3,539	(29,100)	(8,521)
Reclassification of net unrealized loss transferred to held to maturity		0	18,228	0
Other reclassifications included in other revenue		61	9	(4)
Change in net unrealized gain (loss) on held to maturity securities:
Reclassification of net unrealized loss transferred from available for sale		0	(18,228)	0
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale		2,474	707	0
Other		(35)	60	(11)
Other comprehensive income (loss), before tax		6,039	(28,324)	(8,536)
Income tax effect		(1,549)	6,812	2,033
Other comprehensive income (loss), net of tax		4,490	(21,512)	(6,503)
Comprehensive Income (Loss)		$ 9,557	$ (14,329)	$ (648)

[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.