Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 816	$ 884	$ 592
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for Credit Losses	39	40	17
Depreciation and amortization	188	193	179
Share-based compensation	27	26	25
Securities gains, net	3	1	14
Deferred income tax expense (benefit)	(2)	0	154
Net decrease (increase) in trading securities	(76)	42	(33)
Net decrease (increase) in loans held for sale	(84)	9	97
Change in other liabilities	(14)	74	29
Change in other assets	(179)	14	(89)
Other, net	(18)	(26)	(43)
Net cash provided by operating activities	697	1,176	928
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	852	(784)	683
Proceeds from maturities and paydowns of investment securities held-to-maturity	391	361	314
Purchases of investment securities held-to-maturity	(209)	(365)	(216)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	3,105	3,061	2,412
Purchases of investment securities available-for-sale	(1,864)	(2,927)	(4,719)
Net change in loans and leases	(1,957)	(1,943)	(2,135)
Purchases and sales of other noninterest-bearing investments	172	14	(105)
Purchases of premises and equipment	(117)	(129)	(169)
Other, net	(2)	(6)	(16)
Net cash used in investing activities	375	(2,706)	(3,919)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	2,984	1,484	(614)
Net change in short-term funds borrowed	3,600	2,677	2,149
Proceeds from debt over 90 days and up to one year	0	0	5,100
Repayments of debt over 90 days and up to one year	0	(2,000)	(3,100)
Cash paid for preferred stock redemption	0	0	(144)
Repayments of Long-term Debt	0	162	153
Proceeds from the issuance of long-term debt	992	497	0
Bank common stock repurchased	(1,102)	(672)	(321)
Proceeds from Issuance of common stock	14	20	25
Dividends paid on common and preferred stock	(260)	(236)	(129)
Other, net	(9)	(12)	(11)
Net Cash Provided by (Used in) Financing Activities	981	1,596	2,802
Cash and Cash Equivalents, Period Increase (Decrease)	91	66	(189)
Cash and due from banks at beginning of year	614	548	737
Cash and due from banks at end of year	705	614	548
Cash paid for Interest	401	237	118
Net cash paid for income taxes	233	207	246
Loans held for investment transfered to other real estate owned	12	8	6
Loans held for investment reclassified to loans held for sale, net	$ 85	$ 111	$ 25