CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
Net income		$ 439	$ 388
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		85	78
Originations of mortgage loans held for sale		(2,881)	(614)
Proceeds from sales of mortgage loans held for sale		2,918	655
Purchases of commercial loans held for sale		(543)	(468)
Proceeds from sales of commercial loans held for sale		622	451
Depreciation, amortization and accretion		134	122
Mortgage servicing rights valuation recovery		0	(3)
Debt securities impairment		1	1
Deferred income taxes		(1)	8
Share-based compensation		20	18
Net gain on sales of:
Debt securities		(8)	(8)
Premises and equipment		(6)	0
(Increase) decrease in other assets		(97)	331
Decrease in other liabilities		(211)	(255)
Net cash provided by operating activities		472	704
Investment securities:
Purchases of debt securities available for sale		(2,047)	(1,099)
Proceeds from maturities and paydowns of debt securities available for sale		695	806
Proceeds from sales of debt securities available for sale		821	145
Proceeds from maturities and paydowns of debt securities held to maturity		80	131
Purchases of equity securities, at fair value		(56)	(39)
Proceeds from sales of equity securities, at fair value		39	36
Purchases of equity securities, at cost		(76)	(157)
Proceeds from sales of equity securities, at cost		306	131
Net (increase) decrease in interest-bearing deposits in banks		(19)	50
Acquisitions, net of cash acquired		(129)	0
Net increase in loans and leases		(1,047)	(1,020)
Net increase in bank-owned life insurance		(7)	(13)
Premises and equipment:
Purchases		(16)	(32)
Proceeds from sales		31	0
Capitalization of software		(46)	(57)
Net cash used in investing activities		(1,471)	(1,118)
FINANCING ACTIVITIES
Net increase in deposits		4,341	641
Net decrease in federal funds purchased and securities sold under agreements to repurchase		(488)	(500)
Net decrease in other short-term borrowed funds		(150)	(1,604)
Proceeds from issuance of long-term borrowed funds		2,750	6,250
Repayments of long-term borrowed funds		(7,002)	(3,250)
Treasury stock purchased		(200)	(175)
Net proceeds from issuance of preferred stock		292	0
Dividends declared and paid to common stockholders		(149)	(108)
Dividends declared and paid to preferred stockholders		(15)	0
Payments of employee tax withholding for share-based compensation		(18)	(13)
Net cash (used in) provided by financing activities		(639)	1,241
(Decrease) increase in cash and cash equivalents	[1]	(1,638)	827
Cash and cash equivalents at beginning of period	[1]	4,074	3,032
Cash and cash equivalents at end of period	[1]	$ 2,436	$ 3,859

[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.