Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities
Net income	$ 5,383	$ 5,555
Adjustments to reconcile net income to net cash provided by/(used in) operating activities
Provision for credit losses	726	1,169
Depreciation and amortization	1,039	1,057
Amortization of intangibles	193	217
Deferred tax benefit	(444)	(214)
Investment securities gains	(536)	(102)
Stock-based compensation	832	830
Originations and purchases of loans held-for-sale	(9,227)	(22,920)
Proceeds from sales, securitizations and paydowns of loans held-for-sale	6,835	21,773
Net change in trading assets	(4,842)	(5,451)
Net change in securities borrowed	6,826	4,596
Net change in accrued interest and accounts receivable	(3,100)	(9,051)
Net change in other assets	(958)	3,673
Net change in trading liabilities	4,113	(13,879)
Net change in accounts payable and other liabilities	353	2,396
Other operating adjustments	(2,927)	4,372
Net cash provided by/(used in) operating activities	4,266	(5,979)
Investing activities
Net change in deposits with banks	(29,749)	(59,164)
Net change in federal funds sold and securities purchased under resale agreements	(5,218)	5,080
Held-to-maturity securities:
Proceeds	1	2
Available-for-sale securities:
Proceeds from maturities	32,279	20,591
Proceeds from sales	19,971	4,373
Purchases	(63,368)	(39,679)
Proceeds from sales and securitizations of loans held-for-investment	1,375	1,560
Other changes in loans, net	(176)	1,574
Net cash used in business acquisitions or dispositions	(30)	(15)
All other investing activities, net	(447)	(132)
Net cash used in investing activities	(45,362)	(65,810)
Financing activities
Net change in deposits	(4,354)	56,230
Net change in federal funds purchased and securities loaned or sold under repurchase agreements	36,953	8,835
Net change in commercial paper and other borrowed funds	4,266	13,294
Net change in beneficial interests issued by consolidated variable interest entities	2,168	223
Proceeds from long-term borrowings and trust preferred capital debt securities	14,527	17,056
Payments of long-term borrowings and trust preferred capital debt securities	(16,713)	(27,250)
Excess tax benefits related to stock-based compensation	276	765
Treasury stock and warrants purchased	(216)	(95)
Dividends paid	(1,024)	(246)
All other financing activities, net	(531)	(1,484)
Net cash provided by financing activities	35,352	67,328
Effect of exchange rate changes on cash and due from banks	1,525	363
Net decrease in cash and due from banks	(4,219)	(4,098)
Cash and due from banks at the beginning of the period	59,602	27,567
Cash and due from banks at the end of the period	55,383	23,469
Cash interest paid	3,050	3,618
Cash income taxes (refunded)/paid, net	$ (467)	$ 716