CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income:
Interest and fees on loans	$ 877	$ 791	$ 1,742	$ 1,517
Interest on money market investments	56	48	103	105
Interest on securities	140	138	282	275
Total interest income	1,073	977	2,127	1,897
Interest expense:
Interest on deposits	390	220	766	302
Interest on short- and long-term borrowings	86	166	178	325
Total interest expense	476	386	944	627
Net interest income	597	591	1,183	1,270
Provision for credit losses:
Provision for loan and lease losses	12	46	33	92
Provision for unfunded lending commitments	(7)	0	(15)	(1)
Total provision for credit losses	5	46	18	91
Net interest income after provision for credit losses	592	545	1,165	1,179
Noninterest income:
Commercial account fees	45	45	89	88
Card fees	25	25	48	49
Retail and business banking fees	16	16	32	32
Loan-related fees and income	18	19	33	40
Capital markets fees	21	27	45	44
Wealth management fees	15	14	30	29
Other customer-related fees	14	16	28	31
Customer-related noninterest income	154	162	305	313
Fair value and nonhedge derivative income	(1)	1	0	(2)
Dividends and other income (loss)	22	26	28	37
Securities gains (losses), net	4	0	2	1
Total noninterest income	179	189	335	349
Noninterest expense:
Salaries and employee benefits	318	324	649	663
Technology, telecom, and information processing	66	58	128	113
Occupancy and equipment, net	40	40	79	80
Professional and legal services	17	16	33	29
Marketing and business development	13	13	23	25
Deposit insurance and regulatory expense	21	22	55	40
Credit-related expense	6	7	13	13
Other real estate expense, net	(1)	0	(1)	0
Other	29	28	56	57
Total noninterest expense	509	508	1,035	1,020
Income before income taxes	262	226	465	508
Income taxes	61	51	111	129
Net income	201	175	354	379
Preferred stock dividends	(11)	(9)	(21)	(15)
Net earnings applicable to common shareholders	$ 190	$ 166	$ 333	$ 364
Weighted average common shares outstanding during the period:
Basic shares (in shares)	147,115	147,692	147,227	147,852
Diluted shares (in shares)	147,120	147,696	147,231	147,865
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 1.28	$ 1.11	$ 2.24	$ 2.44
Diluted (in dollars per share)	$ 1.28	$ 1.11	$ 2.24	$ 2.44