Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net income	$ 1,271	$ 1,239
Adjustments to reconcile net income to net cash provided (used) by operating activities
Provision for credit losses	189	92
Depreciation and amortization	272	280
Deferred income taxes	111	81
Changes in fair value of mortgage servicing rights	210	(85)
Undistributed earnings of BlackRock	(111)	(133)
Net change in
Trading securities and other short-term investments	358	176
Loans held for sale	320	1,675
Other assets	(2,931)	(1,217)
Accrued expenses and other liabilities	1,796	710
Other	(84)	104
Net cash provided (used) by operating activities	1,401	2,922
Sales
Securities available for sale	840	4,461
Loans	306	479
Repayments/maturities
Securities available for sale	2,103	2,027
Securities held to maturity	510	598
Purchases
Securities available for sale	(3,861)	(5,905)
Securities held to maturity	(23)	(662)
Loans	(468)	(224)
Net change in
Federal funds sold and resale agreements	4,810	97
Interest-earning deposits with banks	(4,368)	(226)
Loans	(6,085)	(1,611)
Other	213	(284)
Net cash provided (used) by investing activities	(6,023)	(1,250)
Net change in
Noninterest-bearing deposits	(2,337)	(1,683)
Interest-bearing deposits	5,736	1,212
Federal funds purchased and repurchase agreements	2,232	87
Commercial paper		(100)
Other borrowed funds	250	(11)
Sales/issuances
Federal Home Loan Bank borrowings	5,000
Bank notes and senior debt	2,147	1,991
Other borrowed funds	397	123
Common and treasury stock	22	33
Repayments/maturities
Federal Home Loan Bank borrowings	(6,000)	(1,500)
Bank notes and senior debt	(1,750)	(1,000)
Other borrowed funds	(296)	(163)
Acquisition of treasury stock	(826)	(840)
Preferred stock cash dividends paid	(63)	(63)
Common stock cash dividends paid	(436)	(358)
Net cash provided (used) by financing activities	4,076	(2,272)
Net Increase (Decrease) In Cash And Due From Banks	(546)	(600)
Cash and due from banks at beginning of period	5,608	5,249
Cash and due from banks at end of period	5,062	4,649
Supplemental Disclosures
Interest paid	907	501
Income taxes paid	30	7
Income taxes refunded	2	11
Leased assets obtained in exchange for new finance lease liabilities	25
Leased assets obtained in exchange for new operating lease liabilities	155
Right-of-use assets recognized at adoption of ASU 2016-02	2,004
Non-cash Investing and Financing Items
Transfer from loans to loans held for sale, net	139	173
Transfer from loans to foreclosed assets	$ 48	$ 45