Loans and Leases - Accruing and Non-Accruing Loans by Class (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 63,676	$ 63,461
Total Accruing	63,771	63,552
Current, non-accruing	360	395
Total Non- Accruing	606	604
Loans and leases	64,377	64,156
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	92	83
Past due, non-accruing	99	62
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	8
Past due, non-accruing	147	147
Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	36,218	35,646
Total Accruing	36,249	35,681
Current, non-accruing	91	120
Total Non- Accruing	218	224
Loans and leases	36,467	35,905
Commercial | Commercial, financial, and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	30	34
Past due, non-accruing	71	35
Commercial | Commercial, financial, and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	56	69
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,420	13,563
Commercial | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	157	143
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,928	14,108
Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,736	13,921
Total Accruing	13,784	13,968
Current, non-accruing	60	57
Total Non- Accruing	144	140
Loans and leases	13,928	14,108
Consumer | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	47	41
Past due, non-accruing	28	16
Consumer | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	6
Past due, non-accruing	56	67
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	555	573
Total Accruing	561	579
Current, non-accruing	1	0
Total Non- Accruing	1	1
Loans and leases	562	580
Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	5
Past due, non-accruing	0	0
Consumer | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	0	1
C&I | Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	31,577	30,943
Total Accruing	31,608	30,978
Current, non-accruing	91	120
Total Non- Accruing	218	224
Loans and leases	31,826	31,202
Nonaccrual, no allowance	196	211
C&I | Commercial | Commercial, financial, and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	30	34
Past due, non-accruing	71	35
C&I | Commercial | Commercial, financial, and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	56	69
Loans to mortgage companies | Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	4,641	4,703
Total Accruing	4,641	4,703
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	4,641	4,703
Loans to mortgage companies | Commercial | Commercial, financial, and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Loans to mortgage companies | Commercial | Commercial, financial, and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Commercial Real Estate | Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	242	238
Commercial Real Estate | Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,167	13,321
Total Accruing	13,177	13,324
Current, non-accruing	208	218
Total Non- Accruing	243	239
Loans and leases	13,420	13,563
Commercial Real Estate | Commercial real estate | Commercial real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	10	3
Past due, non-accruing	0	11
Commercial Real Estate | Commercial real estate | Commercial real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	35	10
HELOC | Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,112	2,115
Total Accruing	2,125	2,129
Current, non-accruing	20	17
Total Non- Accruing	38	35
Loans and leases	2,163	2,164
Nonaccrual, no allowance	4	3
HELOC | Consumer | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	12	14
Past due, non-accruing	6	7
HELOC | Consumer | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	0
Past due, non-accruing	12	11
Real estate installment loans | Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	11,624	11,806
Total Accruing	11,659	11,839
Current, non-accruing	40	40
Total Non- Accruing	106	105
Loans and leases	11,765	11,944
Nonaccrual, no allowance	8	8
Real estate installment loans | Consumer | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	35	27
Past due, non-accruing	22	9
Real estate installment loans | Consumer | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	6
Past due, non-accruing	44	56
Credit card | Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	234	224
Total Accruing	238	228
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	238	228
Credit card | Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	3
Past due, non-accruing	0	0
Credit card | Consumer | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	0	0
Other | Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	321	349
Total Accruing	323	351
Current, non-accruing	1	0
Total Non- Accruing	1	1
Loans and leases	324	352
Other | Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	2	2
Past due, non-accruing	0	0
Other | Consumer | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	$ 0	$ 1