Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Operating Activities
Net income	$ 2,282		$ 2,578
Adjustments to reconcile net income to net cash provided (used) by operating activities
Provision for credit losses	669		962
Depreciation and amortization	861		850
Deferred income taxes	480		160
Net gains on sales of securities	(159)		(187)
Net other-than-temporary impairments	96		108
Gain on sale of Visa Class B common shares	(137)
Mortgage servicing rights valuation adjustment	268		649
Undistributed earnings of BlackRock	(220)		(216)
Excess tax benefits from share-based payment arrangements	(17)
Noncash charge on trust preferred securities redemption	225
Net change in
Trading securities and other short-term investments	857		(137)
Loans held for sale	2		602
Other assets	117		(4,014)
Accrued expenses and other liabilities	566		3,510
Other	(264)		(280)
Net cash provided (used) by operating activities	5,626		4,585
Sales
Securities available for sale	8,510		17,136
Loans	1,220		1,418
Repayments/maturities
Securities available for sale	6,602		4,289
Securities held to maturity	2,417		1,983
Purchases
Securities available for sale	(14,307)		(20,921)
Securities held to maturity	(1,045)		(955)
Loans	(1,468)		(1,494)
Net change in
Federal funds sold and resale agreements	474		1,892
Interest-earning deposits with banks	(863)		(1,162)
Loans	(9,909)		(5,729)
Net cash received (paid) for acquisition activity	(3,294)		261
Purchases of corporate and bank owned life insurance			(200)
Other	30		(244)
Net cash provided (used) by investing activities	(11,633)		(3,726)
Net change in
Noninterest-bearing deposits	1,261		5,069
Interest-bearing deposits	(1,018)		(1,041)
Federal funds purchased and repurchase agreements	547		(1,032)
Commercial Paper	3,028		449
Other borrowed funds	(390)		(1,240)
Sales/issuances
Federal Home Loan Bank borrowings	11,000
Bank notes and senior debt	2,089		1,244
Commercial paper	15,329		6,308
Other borrowed funds	730		279
Preferred stock	1,920		988
Common and treasury stock	147		35
Repayments/maturities
Federal Home Loan Bank borrowings	(8,995)		(1,028)
Bank notes and senior debt	(4,045)		(2,423)
Subordinated debt	(1,783)		(509)
Other borrowed funds	(861)		(607)
Commercial paper	(11,897)		(6,147)
Acquisition of treasury stock	(160)		(66)
Preferred stock cash dividends paid	(125)		(32)
Excess tax benefits from share-based payment arrangements	17
Common stock cash dividends paid	(608)		(421)
Net cash provided (used) by financing activities	6,186		(174)
Net Increase (Decrease) In Cash And Due From Banks	179		685
Cash and due from banks at beginning of period	4,105	[1]	3,297
Cash and due from banks at end of period	4,284	[1]	3,982
Supplemental Disclosures
Interest paid	943		1,165
Income taxes paid	36		836
Income taxes refunded	13		30
Non-cash Investing and Financing Items
Transfer from loans to loans held for sale, net	500		678
Transfer from loans to foreclosed assets	$ 832		$ 576

[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).