CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net income		$ 1,721	$ 1,652	$ 1,045
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		326	321	369
Originations of mortgage loans held for sale		(8,036)	(2,911)	(2,829)
Proceeds from sales of mortgage loans held for sale		8,149	3,161	2,652
Purchases of commercial loans held for sale		(1,944)	(2,057)	(1,355)
Proceeds from sales of commercial loans held for sale		1,857	1,963	1,335
Depreciation, amortization and accretion		489	487	515
Mortgage servicing rights valuation recovery		(3)	(2)	(4)
Debt securities impairment		3	7	12
Deferred income taxes		97	(136)	153
Share-based compensation		41	48	23
Net gain on sales of:
Debt securities		(19)	(11)	(16)
Equity securities		0	(1)	(3)
Premises and equipment		0	0	(2)
Other loans held for sale		0	(17)	(72)
Increase in other assets		(1,217)	(502)	(274)
Increase (decrease) in other liabilities		303	(119)	(59)
Net cash provided by operating activities		1,767	1,883	1,490
Investment securities:
Purchases of securities available for sale		(4,270)	(5,394)	(7,664)
Proceeds from maturities and paydowns of debt securities available for sale		3,258	3,470	3,785
Proceeds from sales of debt securities available for sale		998	1,257	1,966
Purchases of debt securities held to maturity		0	(171)	(523)
Proceeds from maturities and paydowns of debt securities held to maturity		522	561	720
Purchases of equity securities, at fair value		(162)	(326)	(246)
Proceeds from sales of equity securities, at fair value		150	253	220
Purchases of equity securities, at cost		(754)	(400)	(166)
Proceeds from sales of equity securities, at cost		642	637	87
Net decrease (increase) in interest-bearing deposits in banks		44	247	(83)
Purchases of mortgage servicing rights		(16)	(28)	0
Acquisition, net of cash acquired		(533)	0	0
Net increase in loans and leases		(6,445)	(3,634)	(9,074)
Net increase in bank-owned life insurance		(42)	(44)	(48)
Premises and equipment:
Purchases		(232)	(253)	(138)
Proceeds from sales		0	0	3
Capitalization of software		(237)	(159)	(165)
Net cash used in investing activities		(7,077)	(3,984)	(11,326)
FINANCING ACTIVITIES
Net increase in deposits		4,486	5,285	7,265
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		341	(333)	346
Net decrease in other short-term borrowed funds		(5,211)	(4,959)	(3,186)
Proceeds from issuance of long-term borrowed funds		22,503	15,363	15,144
Repayments of long-term borrowed funds		(14,837)	(12,751)	(8,429)
Treasury stock purchased		(1,025)	(820)	(430)
Net proceeds from issuance of preferred stock		593	0	0
Dividends declared and paid to common stockholders		(471)	(322)	(241)
Dividends declared and paid to preferred stockholders		(14)	(14)	(14)
Payments of employee tax withholding for share-based compensation		(13)	(20)	0
Net cash provided by financing activities		6,352	1,429	10,455
Increase (Decrease) in cash and cash equivalents	[1]	1,042	(672)	619
Cash and cash equivalents at beginning of period	[1]	3,032	3,704	3,085
Cash and cash equivalents at end of period	[1]	4,074	3,032	3,704
Supplemental disclosures:
Interest paid		1,184	716	505
Income taxes paid		241	371	94
Non-cash items:
Loans securitized and transferred to securities available for sale		142	134	68
Stock issued for share-based compensation plans		20	22	12
Stock issued for Employee Stock Purchase Plan		14	12	10
Due from broker for securities sold but not settled		$ 0	$ 6	$ 0

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