Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income		$ 48,334	$ 29,131	$ 36,431
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Provision for credit losses		(9,256)	17,480	5,585
Depreciation and amortization		7,932	8,614	8,368
Deferred tax (benefit)/expense(a)	[1]	3,748	(3,573)	1,270
Other		3,274	1,649	1,996
Originations and purchases of loans held-for-sale		(347,864)	(166,504)	(169,289)
Proceeds from sales, securitizations and paydowns of loans held-for-sale		336,413	175,490	171,415
Net change in:
Trading assets		85,710	(148,749)	6,551
Securities borrowed		(45,635)	(20,734)	(27,631)
Accrued interest and accounts receivable		(12,401)	(18,012)	(78)
Other assets	[1]	(11,745)	(42,430)	(17,777)
Trading liabilities		(23,190)	77,198	(14,516)
Accounts payable and other liabilities	[1]	43,162	7,415	(466)
Other operating adjustments		(398)	3,115	2,233
Net cash provided by/(used in) operating activities		78,084	(79,910)	4,092
Net change in:
Federal funds sold and securities purchased under resale agreements		34,473	(47,115)	72,396
Held-to-maturity securities:
Proceeds from paydowns and maturities		50,897	21,360	3,423
Purchases		(111,756)	(12,400)	(13,427)
Available-for-sale securities:
Proceeds from paydowns and maturities		50,075	57,675	52,200
Proceeds from sales		162,748	149,758	70,181
Purchases		(248,785)	(397,145)	(242,149)
Proceeds from sales and securitizations of loans held-for-investment		35,845	23,559	62,095
Other changes in loans, net		(91,797)	(50,263)	(51,743)
All other investing activities, net		(11,044)	(7,341)	(5,035)
Net cash (used in) investing activities		(129,344)	(261,912)	(52,059)
Net change in:
Deposits		293,764	602,765	101,002
Federal funds purchased and securities loaned or sold under repurchase agreements		(20,799)	31,528	1,347
Short-term borrowings		7,773	4,438
Short-term borrowings				(28,561)
Beneficial interests issued by consolidated VIEs		(4,254)	1,347	4,289
Proceeds from long-term borrowings		82,409	78,686	61,085
Payments of long-term borrowings		(54,932)	(105,055)	(69,610)
Proceeds from issuance of preferred stock		7,350	4,500	5,000
Redemption of preferred stock		(2,575)	(1,430)	(4,075)
Treasury stock repurchased		(18,408)	(6,517)	(24,001)
Dividends paid		(12,858)	(12,690)	(12,343)
All other financing activities, net		(1,477)	(927)	(1,146)
Net cash provided by financing activities		275,993	596,645	32,987
Effect of exchange rate changes on cash and due from banks and deposits with banks		(11,508)	9,155	(182)
Net increase/(decrease) in cash and due from banks and deposits with banks		213,225	263,978	(15,162)
Cash and due from banks and deposits with banks at the beginning of the period		527,609	263,631	278,793
Cash and due from banks and deposits with banks at the end of the period		740,834	527,609	263,631
Cash interest paid		5,142	13,077	29,918
Cash income taxes paid, net	[1]	$ 18,737	$ 8,140	$ 6,224

[1] Prior-period amounts have been revised to conform with the current presentation. Refer to Note 25 for further information on revisions to operating activities.