CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
OPERATING ACTIVITIES
Net income		$ 986	$ 763
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		238	267
Originations of mortgage loans held for sale		(2,159)	(1,904)
Proceeds from sales of mortgage loans held for sale		2,372	1,775
Purchases of commercial loans held for sale		(1,513)	(1,053)
Proceeds from sales of commercial loans held for sale		1,441	1,040
Amortization of terminated cash flow hedges, net		(17)	6
Depreciation, amortization and accretion		388	387
Mortgage servicing rights valuation (recovery) charge-off		(1)	6
Securities impairment		6	11
Deferred income taxes		(23)	143
Share-based compensation		35	15
Net gain on sales of:
Debt securities		(9)	(13)
Other investment securities		(1)	0
Premises and equipment		0	(2)
Increase in other assets		(155)	(305)
(Decrease) increase in other liabilities		(138)	62
Net cash provided by operating activities		1,450	1,198
Investment securities:
Purchases of securities available for sale		(4,088)	(4,774)
Proceeds from maturities and paydowns of securities available for sale		2,564	2,658
Proceeds from sales of securities available for sale		914	785
Purchases of securities held to maturity		(171)	(523)
Proceeds from maturities and paydowns of securities held to maturity		422	503
Purchases of other investment securities, at fair value		(286)	(204)
Proceeds from sales of other investment securities, at fair value		217	161
Purchases of other investment securities, at cost		(307)	(84)
Proceeds from sales of other investment securities, at cost		495	70
Net decrease (increase) in interest-bearing deposits in banks		152	(364)
Net increase in loans and leases		(3,549)	(6,724)
Net increase in bank-owned life insurance		(34)	(36)
Premises and equipment:
Purchases		(115)	(44)
Proceeds from sales		0	3
Capitalization of software		(138)	(126)
Net cash used in investing activities		(3,924)	(8,699)
FINANCING ACTIVITIES
Net increase in deposits		3,431	5,788
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase		(695)	98
Net decrease in other short-term borrowed funds		(1,708)	(1,635)
Proceeds from issuance of long-term borrowed funds		12,108	9,644
Repayments of long-term borrowed funds		(11,501)	(6,128)
Treasury stock purchased		(485)	(250)
Dividends declared and paid to common stockholders		(233)	(179)
Dividends declared and paid to preferred stockholders		(7)	(7)
Payments of employee tax withholding for share-based compensation		(20)	0
Net cash provided by financing activities		890	7,331
Decrease in cash and cash equivalents	[1]	(1,584)	(170)
Cash and cash equivalents at beginning of period	[1]	3,704	3,085
Cash and cash equivalents at end of period	[1]	$ 2,120	$ 2,915

[1] Cash and cash equivalents includes cash and due from banks and interest-bearing cash and due from banks as reflected on the Consolidated Balance Sheets.