Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 32,474	$ 24,441	$ 24,733
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Provision for credit losses	4,871	5,290	5,361
Depreciation and amortization	7,791	6,179	5,478
Deferred tax expense	1,721	2,312	4,651
Other	2,717	2,136	1,799
Originations and purchases of loans held-for-sale	(102,141)	(94,628)	(61,107)
Proceeds from sales, securitizations and paydowns of loans held-for-sale	93,453	93,270	60,196
Net change in:
Trading assets	(38,371)	5,673	(20,007)
Securities borrowed	(6,861)	(8,653)	2,313
Accrued interest and accounts receivable	(5,849)	(15,868)	(5,815)
Other assets	(8,833)	3,982	(4,176)
Trading liabilities	18,290	(26,256)	5,198
Accounts payable and other liabilities	14,630	(16,508)	5,087
Other operating adjustments	295	7,803	(1,827)
Net cash provided by/(used in) operating activities	14,187	(10,827)	21,884
Net change in:
Federal funds sold and securities purchased under resale agreements	(123,201)	31,448	(17,468)
Held-to-maturity securities:
Proceeds from paydowns and maturities	2,945	4,563	6,218
Purchases	(9,368)	(2,349)	(143)
Available-for-sale securities:
Proceeds from paydowns and maturities	37,401	56,117	65,950
Proceeds from sales	46,067	90,201	48,592
Purchases	(95,091)	(105,309)	(123,959)
Proceeds from sales and securitizations of loans held-for-investment	29,826	15,791	15,429
Other changes in loans, net	(81,586)	(61,650)	(80,996)
All other investing activities, net	(4,986)	(563)	(2,825)
Net cash provided by/(used in) investing activities	(197,993)	28,249	(89,202)
Net change in:
Deposits	26,728	57,022	97,336
Federal funds purchased and securities loaned or sold under repurchase agreements	23,415	(6,739)	13,007
Short-term borrowings	18,476	16,540
Short-term borrowings			(2,461)
Beneficial interests issued by consolidated VIEs	1,712	(1,377)	(5,707)
Proceeds from long-term borrowings	71,662	56,271	83,070
Payments of long-term borrowings	(76,313)	(83,079)	(68,949)
Proceeds from issuance of preferred stock	1,696	1,258	0
Redemption of preferred stock	(1,696)	(1,258)	0
Treasury stock repurchased	(19,983)	(15,410)	(9,082)
Dividends paid	(10,109)	(8,993)	(8,476)
All other financing activities, net	(1,430)	407	(467)
Net cash provided by financing activities	34,158	14,642	98,271
Effect of exchange rate changes on cash and due from banks and deposits with banks	(2,863)	8,086	(1,482)
Net increase/(decrease) in cash and due from banks and deposits with banks	(152,511)	40,150	29,471
Cash and due from banks and deposits with banks at the beginning of the period	431,304	391,154	361,683
Cash and due from banks and deposits with banks at the end of the period	278,793	431,304	391,154
Cash interest paid	21,152	14,153	9,508
Cash income taxes paid, net	$ 3,542	$ 4,325	$ 2,405