Consolidated Statement of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income		$ 5,725	$ 7,558	$ 5,418
Adjustments to reconcile net income to net cash provided (used) by operating activities
Provision For (Recapture of) Credit Losses		(779)	3,175	773
Depreciation and amortization		1,773	1,497	1,315
Deferred income taxes (benefit)		178	(2,239)	303
Net gains on sales of securities		(64)	(305)
Changes in fair value of mortgage servicing rights		85	799	645
Gain on sale of BlackRock			(5,740)
Undistributed earnings of BlackRock			(174)	(531)
Net change in
Trading securities and other short-term investments		671	957	560
Loans held for sale		(480)	(372)	(123)
Other assets		(454)	(927)	(788)
Accrued expenses and other liabilities		753	(254)	132
Other		(194)	684	(341)
Net cash provided (used) by operating activities		7,214	4,659	7,363
Sales
Securities available for sale		26,329	13,851	7,755
Net proceeds from sale of BlackRock			14,225
Loans		1,843	1,894	1,664
Repayments/maturities
Securities available for sale		30,691	30,901	11,974
Securities held to maturity		131	60	3,348
Purchases
Securities available for sale		(85,496)	(45,356)	(23,739)
Securities held to maturity		(87)	(53)	(1,751)
Loans		(1,891)	(1,982)	(1,027)
Net change in
Federal funds sold and resale agreements		(24)	1,738	4,899
Interest-earning deposits with banks		24,236	(61,760)	(12,520)
Loans		15,616	(3,376)	(14,963)
Net cash paid for acquisition	[1]	(10,511)
Net cash received from divestiture activity				75
Purchases of bank owned life insurance		(950)
Other		(2,682)	(1,264)	(705)
Net cash provided (used) by investing activities		(2,795)	(51,122)	(24,990)
Net change in
Noninterest-bearing deposits		6,697	39,851	(1,166)
Interest-bearing deposits		(320)	36,947	21,882
Federal funds purchased and repurchase agreements		(46)	(5,861)	4,260
Short-term Federal Home Loan Bank borrowings			(6,300)
Short-term Federal Home Loan Bank borrowings				4,800
Other borrowed funds		44	123	(495)
Sales/issuances
Federal Home Loan Bank borrowings			9,060	12,040
Bank notes and senior debt		1,692	3,487	8,977
Subordinated debt				744
Other borrowed funds		822	647	1,131
Preferred stock		1,484
Common and treasury stock		66	65	90
Repayments/maturities
Federal Home Loan Bank borrowings		(3,680)	(15,601)	(22,000)
Bank notes and senior debt		(6,000)	(9,047)	(5,600)
Subordinated debt				(700)
Other borrowed funds		(823)	(639)	(1,174)
Preferred stock redemption			(480)
Acquisition of treasury stock		(1,079)	(1,624)	(3,578)
Preferred stock cash dividends paid		(233)	(229)	(236)
Common stock cash dividends paid		(2,056)	(1,980)	(1,895)
Net cash provided (used) by financing activities		(3,432)	48,419	17,080
Net Increase (Decrease) In Cash And Due From Banks And Restricted Cash		987	1,956	(547)
Net cash provided by discontinued operations			11,542	299
Net cash provided (used) by continuing operations		987	(9,586)	(846)
Cash and due from banks and restricted cash at beginning of period		7,017	5,061	5,608
Cash and due from banks and restricted cash at end of period		8,004	7,017	5,061
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and due from banks at end of period (unrestricted cash)		7,431	6,636	5,061
Restricted cash		573	381
Cash and due from banks and restricted cash at end of period		8,004	7,017	5,061
Supplemental Disclosures
Interest paid		582	1,292	3,742
Income taxes paid		675	3,410	430
Income taxes refunded		73	10	17
Leased assets obtained in exchange for new operating lease liabilities		337	122	317
Right-of-use assets recognized at adoption of ASU 2016-02				2,004
Non-cash Investing and Financing Items
Transfer from loans to loans held for sale, net		869	1,379	958
Transfer from loans to foreclosed assets		27	64	174
Transfer from trading securities to investment securities			$ 289	$ 328

[1] Cash paid to acquire BBVA was $11,480 million. The amount of $10,511 million represents the cash paid for the acquisition less $969 million in cash acquired. See Note 2 Acquisition & Divestiture Activity for more detailed information on the BBVA acquisition.