Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income:
Interest and fees on loans	$ 865	$ 726
Interest on money market investments	47	57
Interest on securities	142	137
Total interest income	1,054	920
Interest expense:
Interest on deposits	376	82
Interest on short- and long-term borrowings	92	159
Total interest expense	468	241
Net interest income	586	679
Provision for credit losses:
Provision for loan and lease losses	21	46
Provision for unfunded lending commitments	(8)	(1)
Total provision for credit losses	13	45
Net interest income after provision for credit losses	573	634
Noninterest income:
Commercial account fees	44	43
Card fees	23	24
Retail and business banking fees	16	16
Loan-related fees and income	15	21
Capital markets fees	24	17
Wealth management fees	15	15
Other customer-related fees	14	15
Customer-related noninterest income	151	151
Fair value and nonhedge derivative income	1	(3)
Dividends and other income (loss)	6	11
Securities gains (losses), net	(2)	1
Total noninterest income	156	160
Noninterest expense:
Salaries and employee benefits	331	339
Technology, telecom, and information processing	62	55
Occupancy and equipment, net	39	40
Professional and legal services	16	13
Marketing and business development	10	12
Deposit insurance and regulatory expense	34	18
Credit-related expense	7	6
Other	27	29
Total noninterest expense	526	512
Income before income taxes	203	282
Income taxes	50	78
Net income	153	204
Preferred stock dividends	(10)	(6)
Net earnings applicable to common shareholders	$ 143	$ 198
Weighted average common shares outstanding during the period:
Basic shares (in shares)	147,338	148,015
Diluted shares (in shares)	147,343	148,038
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 0.96	$ 1.33
Diluted (in dollars per share)	$ 0.96	$ 1.33