Loans and Leases - Balances of Commercial Loan Portfolio Classes, Disaggregated by PD Grade and FICO Score - Current Year (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 64,156	$ 62,565
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	4,551	5,780
2024	5,265	2,818
2023	2,146	3,840
2022	2,991	2,562
2021	1,931	1,121
Prior to 2021	4,240	4,079
LMC	4,703	3,471
Revolving Loans	9,854	9,446
Revolving Loans Converted to Term Loans	224	311
Loans and leases	35,905	33,428
Commercial | Commercial and industrial | PD Grade 1 -12
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	4,492	5,590
2024	5,124	2,607
2023	2,012	3,649
2022	2,706	2,336
2021	1,749	1,055
Prior to 2021	3,997	3,853
LMC	4,703	3,471
Revolving Loans	9,448	8,784
Revolving Loans Converted to Term Loans	210	248
Loans and leases	34,441	31,593
Commercial | Commercial and industrial | PD Grades 13
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	7	106
2024	55	27
2023	42	78
2022	78	47
2021	30	33
Prior to 2021	61	57
LMC	0	0
Revolving Loans	123	279
Revolving Loans Converted to Term Loans	6	2
Loans and leases	402	629
Commercial | Commercial and industrial | PD Grades 14 15 16
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	52	84
2024	86	184
2023	92	113
2022	207	179
2021	152	33
Prior to 2021	182	169
LMC	0	0
Revolving Loans	283	383
Revolving Loans Converted to Term Loans	8	61
Loans and leases	1,062	1,206
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,563	14,421
Commercial | Commercial real estate | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1,372	697
2024	1,022	1,369
2023	1,736	3,813
2022	2,985	3,254
2021	2,117	1,047
Prior to 2021	3,866	3,847
Revolving Loans	372	346
Revolving Loans Converted to Term Loans	93	48
Loans and leases	13,563	14,421
Commercial | Commercial real estate | PD Grade 1 -12 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1,362	694
2024	1,011	1,296
2023	1,726	3,282
2022	2,314	2,778
2021	1,873	894
Prior to 2021	3,457	3,281
Revolving Loans	293	340
Revolving Loans Converted to Term Loans	93	47
Loans and leases	12,129	12,612
Commercial | Commercial real estate | PD Grades 13 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	0
2024	0	42
2023	1	280
2022	191	198
2021	92	37
Prior to 2021	88	130
Revolving Loans	33	0
Revolving Loans Converted to Term Loans	0	1
Loans and leases	405	688
Commercial | Commercial real estate | PD Grades 14 15 16 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	10	3
2024	11	31
2023	9	251
2022	480	278
2021	152	116
Prior to 2021	321	436
Revolving Loans	46	6
Revolving Loans Converted to Term Loans	0	0
Loans and leases	1,029	1,121
Commercial | Credit card and other:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	143	174
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,108	14,047
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1,259	1,454
2024	1,315	2,022
2023	1,803	2,715
2022	2,480	2,119
2021	1,913	959
Prior to 2021	3,174	2,686
Revolving Loans	2,019	1,956
Revolving Loans Converted to Term Loans	145	136
Loans and leases	14,108	14,047
Consumer | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	920	1,045
2024	922	1,493
2023	1,330	2,009
2022	1,830	1,592
2021	1,430	675
Prior to 2021	1,924	1,554
Revolving Loans	1,551	1,430
Revolving Loans Converted to Term Loans	75	56
Loans and leases	9,982	9,854
Consumer | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	119	149
2024	139	197
2023	173	270
2022	250	213
2021	193	99
Prior to 2021	324	271
Revolving Loans	182	175
Revolving Loans Converted to Term Loans	17	17
Loans and leases	1,397	1,391
Consumer | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	94	98
2024	90	140
2023	125	217
2022	202	175
2021	159	72
Prior to 2021	250	242
Revolving Loans	134	150
Revolving Loans Converted to Term Loans	14	18
Loans and leases	1,068	1,112
Consumer | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	92	133
2024	128	160
2023	145	183
2022	163	100
2021	90	75
Prior to 2021	268	294
Revolving Loans	115	146
Revolving Loans Converted to Term Loans	19	25
Loans and leases	1,020	1,116
Consumer | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	9	11
2024	11	10
2023	10	17
2022	16	21
2021	18	20
Prior to 2021	102	122
Revolving Loans	22	30
Revolving Loans Converted to Term Loans	5	9
Loans and leases	193	240
Consumer | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	25	18
2024	25	22
2023	20	19
2022	19	18
2021	23	18
Prior to 2021	306	203
Revolving Loans	15	25
Revolving Loans Converted to Term Loans	15	11
Loans and leases	448	334
Consumer | Credit card and other:
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	36	40
2024	15	38
2023	13	19
2022	7	9
2021	4	6
Prior to 2021	58	106
Revolving Loans	437	436
Revolving Loans Converted to Term Loans	10	15
Loans and leases	580	669
Consumer | Credit card and other: | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	25	21
2024	8	22
2023	8	10
2022	3	4
2021	2	2
Prior to 2021	8	19
Revolving Loans	197	197
Revolving Loans Converted to Term Loans	6	8
Loans and leases	257	283
Consumer | Credit card and other: | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	2	7
2024	1	3
2023	1	1
2022	0	1
2021	0	0
Prior to 2021	1	3
Revolving Loans	13	20
Revolving Loans Converted to Term Loans	1	2
Loans and leases	19	37
Consumer | Credit card and other: | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	2	1
2024	1	2
2023	0	2
2022	1	0
2021	0	0
Prior to 2021	0	2
Revolving Loans	12	14
Revolving Loans Converted to Term Loans	1	0
Loans and leases	17	21
Consumer | Credit card and other: | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1	1
2024	0	2
2023	0	1
2022	0	0
2021	0	0
Prior to 2021	1	3
Revolving Loans	6	15
Revolving Loans Converted to Term Loans	1	4
Loans and leases	9	26
Consumer | Credit card and other: | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1	2
2024	1	1
2023	0	0
2022	0	0
2021	0	0
Prior to 2021	0	1
Revolving Loans	7	9
Revolving Loans Converted to Term Loans	1	0
Loans and leases	10	13
Consumer | Credit card and other: | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	5	8
2024	4	8
2023	4	5
2022	3	4
2021	2	4
Prior to 2021	48	78
Revolving Loans	202	181
Revolving Loans Converted to Term Loans	0	1
Loans and leases	$ 268	$ 289