Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Operating Activities
Net income	$ 1,357		$ 1,744
Adjustments to reconcile net income to net cash provided (used) by operating activities
Provision for credit losses	441		701
Depreciation and amortization	554		569
Deferred income taxes (benefit)	412		(127)
Net gains on sales of securities	(119)		(119)
Net other-than-temporary impairments	72		73
Mortgage servicing rights valuation adjustment	216		230
Undistributed earnings of BlackRock	(132)		(132)
Excess tax benefits from share-based payment arrangements	(15)
Noncash charge on trust preferred securities redemption	130
Net change in
Trading securities and other short-term investments	1,394		779
Loans held for sale	(521)		411
Other assets	168		(1,048)
Accrued expenses and other liabilities	11		583
Other	(154)		41
Net cash provided (used) by operating activities	3,814		3,705
Sales
Securities available for sale	6,594		15,023
Loans	771		1,027
Repayments/maturities
Securities available for sale	4,198		2,792
Securities held to maturity	1,638		1,230
Purchases
Securities available for sale	(10,104)		(12,866)
Securities held to maturity	(100)		(187)
Loans	(672)		(712)
Net change in
Federal funds sold and resale agreements	553		1,340
Interest-earning deposits with banks	(2,537)		(2,897)
Loans	(8,206)		(1,393)
Net cash received (paid) for acquisition activity	(3,294)		261
Other	(82)		(387)
Net cash provided (used) by investing activities	(11,241)		3,231
Net change in
Noninterest-bearing deposits	1,264		2,618
Interest-bearing deposits	(350)		(4,385)
Federal funds purchased and repurchase agreements	836		(327)
Other borrowed funds	3,718		(393)
Sales/issuances
Bank notes and senior debt	2,089
Other borrowed funds	9,665		4,634
Preferred stock	1,482
Common and treasury stock	112		24
Federal Home Loan Bank borrowings	7,000
Repayments/maturities
Federal Home Loan Bank borrowings	(4,497)		(1,021)
Bank notes and senior debt	(3,777)		(2,427)
Subordinated debt	(829)		(524)
Other borrowed funds	(8,760)		(4,251)
Acquisition of treasury stock	(51)		(52)
Preferred stock cash dividends paid	(63)		(28)
Excess tax benefits from share-based payment arrangements	15
Common stock cash dividends paid	(396)		(236)
Net cash provided (used) by financing activities	7,458		(6,368)
Net Increase (Decrease) In Cash And Due From Banks	31		568
Cash and due from banks at beginning of period	4,105	[1]	3,297
Cash and due from banks at end of period	4,136	[1]	3,865
Supplemental Disclosures
Interest paid	633		819
Income taxes paid	22		697
Income taxes refunded	9		27
Non-cash Investing and Financing Items
Transfer from loans to loans held for sale, net	356		429
Transfer from loans to foreclosed assets	$ 509		$ 352

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