Consolidated Statement of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015
Operating Activities
Net income	$ 1,932,000,000		$ 2,048,000,000
Adjustments to reconcile net income to net cash provided (used) by operating activities
Provision for credit losses (benefit)	279,000,000		100,000,000
Depreciation and amortization	561,000,000		530,000,000
Deferred income taxes	(68,000,000)		109,000,000
Net gains on sales of securities	(13,000,000)		(50,000,000)
Changes in fair value of mortgage servicing rights	527,000,000		43,000,000
Gain on sales of Visa Class B common shares	(126,000,000)		(79,000,000)
Undistributed earnings of BlackRock	(148,000,000)		(196,000,000)
Net change in
Trading securities and other short-term investments	(865,000,000)		(22,000,000)
Loans held for sale	(728,000,000)		(391,000,000)
Other assets	(2,516,000,000)		22,000,000
Accrued expenses and other liabilities	2,179,000,000		(186,000,000)
Other	(253,000,000)		(272,000,000)
Net cash provided (used) by operating activities	761,000,000		1,656,000,000
Sales
Securities available for sale	2,084,000,000		2,402,000,000
Loans	875,000,000		958,000,000
Repayments/maturities
Securities available for sale	4,895,000,000		3,933,000,000
Securities held to maturity	1,251,000,000		1,054,000,000
Purchases
Securities available for sale	(7,182,000,000)		(9,706,000,000)
Securities held to maturity	(1,587,000,000)		(3,049,000,000)
Loans	(504,000,000)		(355,000,000)
Net change in
Federal funds sold and resale agreements	(107,000,000)		(119,000,000)
Interest-earning deposits with banks	3,796,000,000		(2,190,000,000)
Loans	(3,659,000,000)		(1,017,000,000)
Other	49,000,000		(394,000,000)
Net cash provided (used) by investing activities	(89,000,000)		(8,483,000,000)
Net change in
Noninterest-bearing deposits	(1,113,000,000)		3,909,000,000
Interest-bearing deposits	2,345,000,000		3,580,000,000
Federal funds purchased and repurchase agreements	(157,000,000)		(1,320,000,000)
Commercial paper			(158,000,000)
Other borrowed funds	524,000,000		712,000,000
Sales/issuances
Federal Home Loan Bank borrowings			2,250,000,000
Bank notes and senior debt	2,856,000,000		4,932,000,000
Commercial paper			1,393,000,000
Other borrowed funds	133,000,000		586,000,000
Common and treasury stock	29,000,000		109,000,000
Repayments Maturities Financing [Abstract]
Federal Home Loan Bank borrowings	(2,053,000,000)		(62,000,000)
Bank notes and senior debt	(993,000,000)		(2,134,000,000)
Subordinated debt	38,000,000		39,000,000
Commercial paper	(14,000,000)		(3,274,000,000)
Other borrowed funds	(461,000,000)		(1,532,000,000)
Preferred stock redemption			(500,000,000)
Acquisition of treasury stock	(1,054,000,000)		(1,020,000,000)
Preferred stock cash dividends paid	(105,000,000)		(115,000,000)
Common stock cash dividends paid	(516,000,000)		(516,000,000)
Net cash provided (used) by financing activities	(541,000,000)		6,879,000,000
Net Increase (Decrease) In Cash And Due From Banks	131,000,000		52,000,000
Cash and due from banks at beginning of period	4,065,000,000	[1]	4,360,000,000
Cash and due from banks at end of period	4,196,000,000		4,412,000,000
Supplemental Disclosures
Interest paid	664,000,000		503,000,000
Income taxes paid	284,000,000		191,000,000
Income taxes refunded	35,000,000		1,000,000
Non-cash Investing and Financing Items
Transfer from (to) loans to (from) loans held for sale, net	367,000,000		3,000,000
Transfer from loans to foreclosed assets	$ 158,000,000		$ 227,000,000

[1] Our consolidated assets at June 30, 2016 included the following assets of certain variable interest entities (VIEs): Equity investments of $220 million and Other assets of $47 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.