Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income
Loans and leases, including fees	$ 2,097	$ 1,850
Investment securities
Fully taxable	212	181
Exempt from federal taxes	16	17
Deposits at banks	419	278
Other	1	1
Total interest income	2,745	2,327
Interest expense
Savings and interest-checking deposits	615	277
Time deposits	225	89
Short-term borrowings	84	58
Long-term borrowings	141	85
Total interest expense	1,065	509
Net interest income	1,680	1,818
Provision for credit losses	200	120
Net interest income after provision for credit losses	1,480	1,698
Other income
Brokerage services income	29	24
Trading account and other non-hedging derivative gains	9	12
Gain (loss) on bank investment securities	2
Other revenues from operations	152	159
Total other income	580	587
Other expense
Salaries and employee benefits	833	808
Equipment and net occupancy	129	127
Outside data processing and software	120	106
Professional and other services	85	125
FDIC assessments	60	30
Advertising and marketing	20	31
Amortization of core deposit and other intangible assets	15	17
Other costs of operations	134	115
Total other expense	1,396	1,359
Income before taxes	664	926
Income taxes	133	224
Net income	531	702
Net income available to common shareholders
Basic	505	676
Diluted	$ 505	$ 676
Net income per common share
Basic	$ 3.04	$ 4.03
Diluted	$ 3.02	$ 4.01
Average common shares outstanding
Basic	166,460	167,732
Diluted	167,084	168,410
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 104	$ 85
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	124	113
Trust Income [Member]
Other income
Revenue from contract with customer	$ 160	$ 194