CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income		$ 1,341	$ 1,256
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		283	241
Originations of mortgage loans held for sale		(14,047)	(4,384)
Proceeds from sales of mortgage loans held for sale		13,265	4,259
Purchases of commercial loans held for sale		(1,507)	(1,450)
Proceeds from sales of commercial loans held for sale		1,592	1,457
Depreciation, amortization and accretion		440	357
Mortgage servicing rights valuation charge-off (recovery)		15	(3)
Debt securities impairment		2	3
Deferred income taxes		(41)	23
Share-based compensation		44	40
Net gain on sales of:
Debt securities		(21)	(13)
Premises and equipment		(6)	0
Increase in other assets		(523)	(918)
Increase in other liabilities		133	339
Net cash provided by operating activities		970	1,207
Investment securities:
Purchases of debt securities available for sale		(4,633)	(3,084)
Proceeds from maturities and paydowns of debt securities available for sale		2,728	2,512
Proceeds from sales of debt securities available for sale		1,495	405
Proceeds from maturities and paydowns of debt securities held to maturity		280	402
Other, net		136	(6)
Purchases of equity securities, at cost		(328)	(568)
Proceeds from sales of equity securities, at cost		428	416
Net (increase) decrease in interest-bearing deposits in banks		(10)	50
Purchases of mortgage servicing rights		0	(16)
Acquisitions, net of cash acquired		(129)	(533)
Net increase in loans and leases		(1,534)	(4,278)
Net increase in bank-owned life insurance		(22)	(31)
Premises and equipment:
Purchases		(78)	(157)
Proceeds from sales		31	0
Capitalization of software		(150)	(175)
Net cash used in investing activities		(1,786)	(5,063)
FINANCING ACTIVITIES
Net increase in deposits		5,139	1,986
Net decrease in federal funds purchased and securities sold under agreements to repurchase		(289)	(441)
Net increase (decrease) in other short-term borrowed funds		45	(3,107)
Proceeds from issuance of long-term borrowed funds		7,300	17,503
Repayments of long-term borrowed funds		(10,556)	(10,333)
Treasury stock purchased		(820)	(725)
Net proceeds from issuance of preferred stock		293	296
Dividends declared and paid to common stockholders		(459)	(344)
Dividends declared and paid to preferred stockholders		(48)	(7)
Payments of employee tax withholding for share-based compensation		(21)	(13)
Net cash provided by financing activities		584	4,815
(Decrease) increase in cash and cash equivalents	[1]	(232)	959
Cash and cash equivalents at beginning of period	[1]	4,074	3,032
Cash and cash equivalents at end of period	[1]	$ 3,842	$ 3,991

[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.