Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Nonvoting Common Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Nonvoting Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock, at cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2018	$ 20,670		$ 2,793	$ 15	$ 0	$ 4,499	$ 17,329	$ (3,714)	$ (252)
Beginning Balance (shares) at Dec. 31, 2018				1,488	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,704						3,704
Other comprehensive income (loss), net of tax	340								340
Dividends declared on preferred stock	(161)						(161)
Dividends declared on common stock	(899)						(899)
Repurchase of common stock	(2,220)							(2,220)
Stock option exercises and other	118					(56)		174
Share-based compensation	171					171
Other	22					42	(13)	(7)
Ending Balance at Dec. 31, 2019	21,745		2,793	$ 15	$ 0	4,656	19,960	(5,767)	88
Ending Balance (shares) at Dec. 31, 2019				1,488	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,299	$ 44					3,299
Other comprehensive income (loss), net of tax	5,306								5,306
Acquisition of TD Ameritrade (shares)				509	77
Acquisition of TD Ameritrade	21,758			$ 5	$ 1	21,757		(5)
Issuance of preferred stock, net	4,940		4,940
Dividends declared on preferred stock	(240)						(240)
Dividends declared on common stock	(1,040)						(1,040)
Stock option exercises and other	79					(121)		200
Share-based compensation	192					192
Other (shares)				(2)	2
Other	21					31	(4)	(6)
Ending Balance at Dec. 31, 2020	56,060		7,733	$ 20	$ 1	26,515	21,975	(5,578)	5,394
Ending Balance (shares) at Dec. 31, 2020				1,995	79
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,855	$ 245					5,855
Other comprehensive income (loss), net of tax	(6,503)								(6,503)
Issuance of preferred stock, net	2,806		2,806
Redemption of preferred stock	(600)		(585)				(15)
Dividends declared on preferred stock	(456)						(456)
Dividends declared on common stock	(1,367)						(1,367)
Stock option exercises and other	221					(84)		305
Share-based compensation	229					229
Other	16					81		(65)
Ending Balance at Dec. 31, 2021	$ 56,261		$ 9,954	$ 20	$ 1	$ 26,741	$ 25,992	$ (5,338)	$ (1,109)
Ending Balance (shares) at Dec. 31, 2021				1,995	79