Consolidated Cash Flow Statements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income	$ 11,179	$ 9,237	$ 8,883
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Deferred income taxes	(250)	165	449
Stock-based compensation expense	1,312	1,153	920
Depreciation and amortization	3,769	2,643	1,844
Provision for (Release of) credit losses on lending activities	762	162	(15)
Other operating adjustments	274	(195)	199
Changes in assets and liabilities:
Trading assets, net of Trading liabilities	15,550	(13,668)	23,732
Securities borrowed	(5,076)	9,764	7,697
Securities loaned	(1,541)	(3,402)	(1,684)
Customer and other receivables and other assets	(29,774)	233	(728)
Customer and other payables and other liabilities	10,187	19,942	(13,063)
Securities purchased under agreements to resell	(28,010)	10,298	(14,264)
Securities sold under agreements to repurchase	(3,613)	4,441	(6,665)
Net cash provided by (used for) operating activities	(25,231)	40,773	7,305
Cash flows from investing activities
Other assets—Premises, equipment and software, net	(1,444)	(1,826)	(1,865)
Changes in loans, net	(17,949)	(17,359)	(8,794)
Investment securities:
Purchases	(59,777)	(42,586)	(27,800)
Proceeds from sales	13,750	17,151	3,208
Proceeds from paydowns and maturities	24,517	12,012	12,668
Cash acquired as part of the E*TRADE acquisition	3,807	0	0
Other investing activities	(802)	(953)	(298)
Net cash provided by (used for) investing activities	(37,898)	(33,561)	(22,881)
Net proceeds from (payments for):
Other secured financings	2,794	3,695	(1,226)
Deposits	75,417	2,513	28,384
Issuance of preferred stock, net of issuance costs	0	497	0
Proceeds from issuance of Borrowings	60,726	30,605	40,059
Payments for:
Borrowings	(50,484)	(40,548)	(34,781)
Repurchases of common stock and employee tax withholdings	(1,890)	(5,954)	(5,566)
Cash dividends	(2,739)	(2,627)	(2,375)
Other financing activities	(40)	(147)	(290)
Net cash provided by (used for) financing activities	83,784	(11,966)	24,205
Effect of exchange rate changes on cash and cash equivalents	2,828	(271)	(1,828)
Net increase (decrease) in cash and cash equivalents	23,483	(5,025)	6,801
Cash and cash equivalents, at beginning of period	82,171	87,196	80,395
Cash and cash equivalents, at end of period	105,654	82,171	87,196
Supplemental Disclosure of Cash Flow Information
Cash payments for interest	4,120	12,511	9,977
Cash payments for income taxes, net of refunds	$ 2,591	$ 1,908	$ 1,377