CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income on:
Loans, including fees	$ 1,463	$ 1,462	$ 4,316	$ 4,276
Debt securities	241	185	669	557
Loans held for sale	11	14	28	31
Other earning assets	105	105	293	282
Total interest income	1,820	1,766	5,306	5,146
Interest expense on:
Deposits	507	367	1,504	806
Short-term borrowings	10	39	24	86
Long-term borrowings	85	69	190	165
Total Interest Expense	602	475	1,718	1,057
Net interest income	1,218	1,291	3,588	4,089
Provision (benefit from) for credit losses	113	145	367	398
Net interest income after provision for credit losses	1,105	1,146	3,221	3,691
Non-interest income:
Total Noninterest Income	572	566	1,680	1,676
Non-interest expense:
Salaries and employee benefits	645	589	1,912	1,808
Equipment and Software Expense	101	107	302	310
Net occupancy expense	69	72	$ 211	218
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]			Other
Other	254	325	$ 779	895
Total non-interest expense	1,069	1,093	3,204	3,231
Income before income taxes	608	619	1,697	2,136
Income tax expense	118	129	338	453
Net income	490	490	1,359	1,683
Net income available to common shareholders	$ 446	$ 465	$ 1,266	$ 1,609
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic	914	939	917	938
Diluted	918	940	919	940
Earnings Per Share [Abstract]
Basic	$ 0.49	$ 0.49	$ 1.38	$ 1.72
Diluted	$ 0.49	$ 0.49	$ 1.38	$ 1.71
Service charges on deposit accounts
Non-interest income:
Total Noninterest Income	$ 158	$ 142	$ 457	$ 449
Card and ATM fees
Non-interest income:
Total Noninterest Income	118	126	354	377
Investment management and trust fee income
Non-interest income:
Total Noninterest Income	85	79	249	232
Capital Markets [Member]
Non-interest income:
Total Noninterest Income	92	64	251	174
Mortgage income
Non-interest income:
Total Noninterest Income	36	28	111	78
Securities gains, net [Member]
Non-interest income:
Total Noninterest Income	(78)	(1)	(178)	(3)
Other [Member]
Non-interest income:
Total Noninterest Income	$ 161	$ 128	$ 436	$ 369