Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income	$ 1,151	$ 1,168	$ 497
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	60	(384)	537
(Benefit) provision for deferred income taxes	(27)	79	(82)
Depreciation and amortization	92	99	108
Net periodic defined benefit credit	(91)	(81)	(55)
Share-based compensation expense	60	41	24
Net amortization of securities	30	36	15
Net gains on sales of foreclosed property	(2)	0	(1)
Net change in accrued income receivable	(152)	13	25
Net change in accrued expenses payable	131	132	(29)
Other, net	(614)	(469)	(111)
Net cash provided by operating activities	638	634	928
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	2,511	5,536	3,350
Purchases of investment securities available-for-sale	(7,470)	(7,936)	(5,804)
Net change in loans	(4,824)	4,067	(2,136)
Proceeds from sales of foreclosed property	3	8	5
Net increase in premises and equipment	(82)	(70)	(79)
Purchases of Federal Home Loan Bank stock	(131)	0	(51)
Redemptions of Federal Home Loan Bank stock	0	115	92
Proceeds from bank-owned life insurance settlements	39	16	20
Other, net	2	(13)	1
Net cash (used in) provided by investing activities	(9,952)	1,723	(4,602)
FINANCING ACTIVITIES
Net change in deposits	(10,401)	8,438	15,554
Net change in short-term borrowings	3,211	0	(71)
Maturities and redemptions of medium- and long-term debt	0	(2,800)	(1,675)
Issuances and advances of medium- and long-term debt	500	0	0
Issuance of preferred stock	0	0	394
Cash dividends paid on preferred stock	(23)	(23)	(8)
Repurchases of common stock	(43)	(729)	(199)
Cash dividends paid on common stock	(353)	(369)	(375)
Issuances of common stock under employee stock plans	28	34	4
Other, net	(2)	4	(1)
Net cash (used in) provided by financing activities	(7,083)	4,555	13,623
Net (decrease) increase in cash and cash equivalents	(16,397)	6,912	9,949
Cash and cash equivalents at beginning of period	22,679	15,767	5,818
Cash and cash equivalents at end of period	6,282	22,679	15,767
Interest paid	130	57	203
Income taxes paid	$ 277	$ 157	$ 141