Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income:
Interest and fees on loans	$ 726	$ 437
Interest on money market investments	57	6
Interest on securities	137	112
Total interest income	920	555
Interest expense:
Interest on deposits	82	6
Interest on short- and long-term borrowings	159	5
Total interest expense	241	11
Net interest income	679	544
Provision for credit losses:
Provision for loan and lease losses	46	(29)
Provision for unfunded lending commitments	(1)	(4)
Total provision for credit losses	45	(33)
Net interest income after provision for credit losses	634	577
Noninterest income:
Commercial account fees	43	41
Card fees	24	25
Retail and business banking fees	16	20
Loan-related fees and income	21	22
Capital markets fees	17	15
Wealth management fees	15	14
Other customer-related fees	15	14
Customer-related noninterest income	151	151
Fair value and nonhedge derivative income	(3)	6
Dividends and other income (loss)	11	2
Securities gains (losses), net	1	(17)
Total noninterest income	160	142
Noninterest expense:
Salaries and employee benefits	339	312
Technology, telecom, and information processing	55	52
Occupancy and equipment, net	40	38
Professional and legal services	13	14
Marketing and business development	12	8
Deposit insurance and regulatory expense	18	10
Credit-related expense	6	7
Other real estate expense, net	0	1
Other	29	22
Total noninterest expense	512	464
Income before income taxes	282	255
Income taxes	78	52
Net income	204	203
Preferred stock dividends	(6)	(8)
Net earnings applicable to common shareholders	$ 198	$ 195
Weighted average common shares outstanding during the period:
Basic shares (in shares)	148,015	151,285
Diluted shares (in shares)	148,038	151,687
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 1.33	$ 1.27
Diluted (in dollars per share)	$ 1.33	$ 1.27