Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income		$ 26,248	$ 7,552
Adjustments to reconcile net income to net cash used in operating activities:
Provision for credit losses		(6,441)	18,758
Depreciation and amortization		4,073	4,346
Deferred tax (benefit)/expense	[1]	1,027	(4,657)
Other		1,788	1,197
Originations and purchases of loans held-for-sale		(184,866)	(76,335)
Proceeds from sales, securitizations and paydowns of loans held-for-sale		161,030	83,745
Net change in:
Trading assets		(2,004)	(133,131)
Securities borrowed		(25,838)	(2,777)
Accrued interest and accounts receivable		(34,929)	374
Other assets	[1]	2,709	(24,204)
Trading liabilities		(3,521)	69,341
Accounts payable and other liabilities	[1]	30,772	18,869
Other operating adjustments		(390)	(248)
Net cash (used in) operating activities		(30,342)	(37,170)
Net change in:
Federal funds sold and securities purchased under resale agreements		35,283	(7,580)
Held-to-maturity securities:
Proceeds from paydowns and maturities		26,224	5,632
Purchases		(63,072)	(5,014)
Available-for-sale securities:
Proceeds from paydowns and maturities		28,727	27,070
Proceeds from sales		125,192	65,975
Purchases		(109,944)	(242,608)
Proceeds from sales and securitizations of loans held-for-investment		16,165	12,185
Other changes in loans, net		(21,980)	(33,234)
Net purchases of assets pursuant to nonrecourse advances provided by the FRBB under the MMLF		0	(3,787)
All other investing activities, net		(3,506)	(2,118)
Net cash provided by/(used in) investing activities		33,089	(183,479)
Net change in:
Deposits		138,578	382,784
Federal funds purchased and securities loaned or sold under repurchase agreements		30,260	51,894
Short-term borrowings		5,862	7,992
Beneficial interests issued by consolidated VIEs		(674)	3,619
Proceeds from long-term borrowings		55,767	57,744
Payments of long-term borrowings		(33,464)	(42,944)
Proceeds from issuance of preferred stock		5,350	4,500
Redemption of preferred stock		(2,575)	(1,430)
Treasury stock repurchased		(11,000)	(6,517)
Dividends paid		(6,314)	(6,342)
All other financing activities, net		(822)	136
Net cash provided by financing activities		180,968	451,436
Effect of exchange rate changes on cash and due from banks and deposits with banks		(5,903)	(689)
Net increase in cash and due from banks and deposits with banks		177,812	230,098
Cash and due from banks and deposits with banks at the beginning of the period		527,609	263,631
Cash and due from banks and deposits with banks at the end of the period		705,421	493,729
Cash interest paid		2,461	9,239
Cash income taxes paid, net	[1]	$ 13,716	$ 4,142

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