Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities
Net income	$ 21,284	$ 18,976	$ 17,370
Adjustments to reconcile net income to net cash provided by/(used in) operating activities
Provision for credit losses	3,385	7,574	16,639
Depreciation and amortization	4,190	4,257	4,029
Amortization of intangibles	957	848	936
Deferred tax expense/(benefit)	1,130	1,693	(968)
Investment securities gains	(2,110)	(1,593)	(2,965)
Stock-based compensation	2,545	2,675	3,251
Originations and purchases of loans held-for-sale	(34,026)	(52,561)	(37,085)
Proceeds from sales, securitizations and paydowns of loans held-for-sale	33,202	54,092	40,155
Net change in trading assets	(5,379)	36,443	(72,082)
Net change in securities borrowed	23,455	(18,936)	(3,926)
Net change in accrued interest and accounts receivable	1,732	8,655	443
Net change in other assets	(4,683)	(15,456)	(12,452)
Net change in trading liabilities	(3,921)	7,905	19,344
Net change in accounts payable and other liabilities	(13,069)	35,203	17,325
Other operating adjustments	(3,613)	6,157	6,234
Net cash provided by/(used in) operating activities	25,079	95,932	(3,752)
Investing activities
Net change in deposits with banks	(36,595)	(63,592)	41,625
Net change in federal funds sold and securities purchased under resale agreements	(60,821)	(12,490)	(26,957)
Held-to-maturity securities:
Proceeds	4	6	7
Available-for-sale securities:
Proceeds from maturities	112,633	86,850	92,740
Proceeds from sales	81,957	68,631	118,600
Purchases	(189,630)	(202,309)	(179,487)
Proceeds from sales and securitizations of loans held-for-investment	6,430	10,478	9,476
Other changes in loans, net	(30,491)	(58,365)	3,022
Net cash received from/(used in) business acquisitions or dispositions	88	102	(4,910)
All other investing activities, net	(3,400)	(63)	(114)
Net cash (used in)/provided by investing activities	(119,825)	(170,752)	54,002
Financing activities
Net change in deposits	67,250	203,420	(9,637)
Net change in federal funds purchased and securities loaned or sold under repurchase agreements	26,546	(63,116)	15,202
Net change in commercial paper and other borrowed funds	9,315	7,230	(6,869)
Net change in beneficial interests issued by consolidated variable interest entities	345	1,165	2,426
Proceeds from long-term borrowings and trust preferred capital debt securities	86,271	54,844	55,181
Payments of long-term borrowings and trust preferred capital debt securities	(96,473)	(82,078)	(99,043)
Excess tax benefits related to stock-based compensation	255	867	26
Redemption of preferred stock	0	0	(352)
Proceeds from issuance of preferred stock	1,234	0	0
Treasury stock and warrants repurchased	(1,653)	(8,863)	(2,999)
Dividends paid	(5,194)	(3,895)	(1,486)
All other financing activities, net	(189)	(1,868)	(1,666)
Net cash provided by/(used in) financing activities	87,707	107,706	(49,217)
Effect of exchange rate changes on cash and due from banks	1,160	(851)	328
Net (decrease)/increase in cash and due from banks	(5,879)	32,035	1,361
Cash and due from banks at the beginning of the period	59,602	27,567	26,206
Cash and due from banks at the end of the period	53,723	59,602	27,567
Cash interest paid	11,161	13,725	12,404
Cash income taxes paid, net	$ 2,050	$ 8,153	$ 9,747