CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES
Net income		$ 892	$ 813
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		182	163
Originations of mortgage loans held for sale		(7,741)	(1,345)
Proceeds from sales of mortgage loans held for sale		7,148	1,325
Purchases of commercial loans held for sale		(1,076)	(1,024)
Proceeds from sales of commercial loans held for sale		1,198	1,039
Depreciation, amortization and accretion		275	243
Mortgage servicing rights valuation charge-off (recovery)		14	(3)
Debt securities impairment		1	2
Deferred income taxes		(10)	10
Share-based compensation		32	28
Net gain on sales of:
Debt securities		(16)	(10)
Premises and equipment		(7)	0
(Increase) decrease in other assets		(236)	283
Decrease in other liabilities		(79)	(109)
Net cash provided by operating activities		577	1,415
Investment securities:
Purchases of debt securities available for sale		(3,502)	(2,343)
Proceeds from maturities and paydowns of debt securities available for sale		1,625	1,636
Proceeds from sales of debt securities available for sale		1,250	273
Proceeds from maturities and paydowns of debt securities held to maturity		171	271
Purchases of equity securities, at fair value		(549)	(80)
Proceeds from sales of equity securities, at fair value		683	78
Purchases of equity securities, at cost		(258)	(334)
Proceeds from sales of equity securities, at cost		386	287
Net (increase) decrease in interest-bearing deposits in banks		(38)	78
Purchases of mortgage servicing rights		0	(16)
Acquisitions, net of cash acquired		(129)	0
Net increase in loans and leases		(806)	(2,992)
Net increase in bank-owned life insurance		(13)	(21)
Premises and equipment:
Purchases		(41)	(94)
Proceeds from sales		31	0
Capitalization of software		(98)	(116)
Net cash used in investing activities		(1,288)	(3,373)
FINANCING ACTIVITIES
Net increase in deposits		4,429	1,984
Net decrease in federal funds purchased and securities sold under agreements to repurchase		(24)	(489)
Net increase (decrease) in other short-term borrowed funds		147	(2,356)
Proceeds from issuance of long-term borrowed funds		4,500	11,500
Repayments of long-term borrowed funds		(9,005)	(7,584)
Treasury stock purchased		(320)	(325)
Net proceeds from issuance of preferred stock		293	296
Dividends declared and paid to common stockholders		(297)	(215)
Dividends declared and paid to preferred stockholders		(30)	(7)
Payments of employee tax withholding for share-based compensation		(21)	(13)
Net cash (used in) provided by financing activities		(328)	2,791
(Decrease) increase in cash and cash equivalents	[1]	(1,039)	833
Cash and cash equivalents at beginning of period	[1]	4,074	3,032
Cash and cash equivalents at end of period	[1]	$ 3,035	$ 3,865

[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.