Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Operating Activities
Net income	$ 943		$ 1,004
Adjustments to reconcile net income to net cash provided (used) by operating activities
Provision for credit losses (benefit)	152		54
Depreciation and amortization	270		252
Deferred income taxes	(49)		40
Net gains on sales of securities	(9)		(42)
Changes in fair value of mortgage servicing rights	341		143
Gain on sales of Visa Class B common shares	(44)
Undistributed earnings of BlackRock	(61)		(96)
Net change in
Trading securities and other short-term investments	(946)		(229)
Loans held for sale	51		(268)
Other assets	(1,310)		(1,449)
Accrued expenses and other liabilities	1,084		1,044
Other	(146)		(193)
Net cash provided (used) by operating activities	276		260
Sales
Securities available for sale	782		1,787
Loans	371		389
Repayments/maturities
Securities available for sale	2,005		1,762
Securities held to maturity	523		486
Purchases
Securities available for sale	(3,441)		(6,170)
Securities held to maturity	(687)		(2,000)
Loans	(363)		(242)
Net change in
Federal funds sold and resale agreements	246		(41)
Interest-earning deposits with banks	1,067		581
Loans	(1,530)		(173)
Other	119		(265)
Net cash provided (used) by investing activities	(908)		(3,886)
Net change in
Noninterest-bearing deposits	(877)		1,488
Interest-bearing deposits	2,641		2,804
Federal funds purchased and repurchase agreements	718		(1,308)
Commercial paper			(109)
Other borrowed funds	128		1,104
Sales/issuances
Federal Home Loan Bank borrowings			1,250
Bank notes and senior debt	997		1,743
Commercial paper			1,322
Other borrowed funds	80		549
Common and treasury stock	18		60
Repayments Maturities Financing [Abstract]
Federal Home Loan Bank borrowings	(1,050)		(31)
Bank notes and senior debt	(997)		(1,397)
Subordinated debt	18		14
Commercial paper	(13)		(1,809)
Other borrowed funds	(360)		(1,481)
Acquisition of treasury stock	(551)		(463)
Preferred stock cash dividends paid	(64)		(68)
Common stock cash dividends paid	(260)		(251)
Net cash provided (used) by financing activities	428		3,417
Net Increase (Decrease) In Cash And Due From Banks	(204)		(209)
Cash and due from banks at beginning of period	4,065	[1]	4,360
Cash and due from banks at end of period	3,861		4,151
Supplemental Disclosures
Interest paid	345		251
Income taxes paid	19		28
Income taxes refunded	33		1
Non-cash Investing and Financing Items
Transfer from (to) loans to (from) loans held for sale, net			(7)
Transfer from (to) loans to (from) loans held for sale, net	191
Transfer from loans to foreclosed assets	$ 81		$ 103

[1] Our consolidated assets at March 31, 2016 included the following assets of certain variable interest entities (VIEs): Equity investments of $326 million and Other assets of $41 million. Our consolidated assets at December 31, 2015 included the following assets of certain VIEs: Cash and due from banks of $11 million, Interest-earning deposits with banks of $4 million, Net loans of $1.3 billion, Equity investments of $183 million, and Other assets of $402 million.