Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 6,529	$ 4,924
Adjustments to reconcile net income to net cash provided by/(used in) operating activities
Provision for credit losses	617	726
Depreciation and amortization	822	1,039
Amortization of intangibles	152	193
Deferred tax expense/(benefit)	1,821	(444)
Investment securities gains	(509)	(536)
Stock-based compensation	641	832
Originations and purchases of loans held-for-sale	(16,495)	(9,227)
Proceeds from sales, securitizations and paydowns of loans held-for-sale	16,963	6,835
Net change in trading assets	28,255	(4,475)
Net change in securities borrowed	4,985	6,826
Net change in accrued interest and accounts receivable	(12,687)	(3,100)
Net change in other assets	(1,955)	(1,159)
Net change in trading liabilities	(6,567)	4,406
Net change in accounts payable and other liabilities	(2,104)	353
Other operating adjustments	(504)	(2,927)
Net cash provided by operating activities	19,964	4,266
Investing activities
Net change in deposits with banks	(135,936)	(29,749)
Net change in federal funds sold and securities purchased under resale agreements	77,882	(5,218)
Held-to-maturity securities:
Proceeds	0	1
Available-for-sale securities:
Proceeds from maturities	31,175	32,279
Proceeds from sales	20,073	19,971
Purchases	(50,980)	(63,368)
Proceeds from sales and securitizations of loans held-for-investment	2,915	1,375
Other changes in loans, net	344	(176)
Net cash used in business acquisitions or dispositions	(37)	(30)
All other investing activities, net	(891)	(447)
Net cash used in investing activities	(55,455)	(45,362)
Financing activities
Net change in deposits	2,876	(4,354)
Net change in federal funds purchased and securities loaned or sold under repurchase agreements	8,146	36,953
Net change in commercial paper and other borrowed funds	3,333	4,266
Net change in beneficial interests issued by consolidated variable interest entities	(2,526)	2,168
Proceeds from long-term borrowings and trust preferred capital debt securities	36,698	14,527
Payments of long-term borrowings and trust preferred capital debt securities	(16,467)	(16,713)
Excess tax benefits related to stock-based compensation	69	276
Proceeds from Issuance of Preferred Stock	878	0
Treasury stock purchased	(2,578)	(216)
Dividends paid	(1,242)	(1,024)
All other financing activities, net	(1,007)	(531)
Net cash provided by financing activities	28,180	35,352
Effect of exchange rate changes on cash and due from banks	(888)	1,525
Net decrease in cash and due from banks	(8,199)	(4,219)
Cash and due from banks at the beginning of the period	53,723	59,602
Cash and due from banks at the end of the period	45,524	55,383
Cash interest paid	2,757	3,050
Cash income taxes paid/(refunded), net	$ 349	$ (467)