Loans and Leases - Balances of Commercial Loan Portfolio Classes, Disaggregated by PD Grade and FICO Score - Prior 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]
2024	4,551	5,780
2023	5,265	2,818
2022	2,146	3,840
2021	2,991	2,562
2020	1,931	1,121
Prior to 2020	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]
2024	4,492	5,590
2023	5,124	2,607
2022	2,012	3,649
2021	2,706	2,336
2020	1,749	1,055
Prior to 2020	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]
2024	7	106
2023	55	27
2022	42	78
2021	78	47
2020	30	33
Prior to 2020	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]
2024	52	84
2023	86	184
2022	92	113
2021	207	179
2020	152	33
Prior to 2020	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]
2024	1,372	697
2023	1,022	1,369
2022	1,736	3,813
2021	2,985	3,254
2020	2,117	1,047
Prior to 2020	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]
2024	1,362	694
2023	1,011	1,296
2022	1,726	3,282
2021	2,314	2,778
2020	1,873	894
Prior to 2020	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]
2024	0	0
2023	0	42
2022	1	280
2021	191	198
2020	92	37
Prior to 2020	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]
2024	10	3
2023	11	31
2022	9	251
2021	480	278
2020	152	116
Prior to 2020	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]
2024	1,259	1,454
2023	1,315	2,022
2022	1,803	2,715
2021	2,480	2,119
2020	1,913	959
Prior to 2020	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]
2024	920	1,045
2023	922	1,493
2022	1,330	2,009
2021	1,830	1,592
2020	1,430	675
Prior to 2020	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]
2024	119	149
2023	139	197
2022	173	270
2021	250	213
2020	193	99
Prior to 2020	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]
2024	94	98
2023	90	140
2022	125	217
2021	202	175
2020	159	72
Prior to 2020	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]
2024	92	133
2023	128	160
2022	145	183
2021	163	100
2020	90	75
Prior to 2020	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]
2024	9	11
2023	11	10
2022	10	17
2021	16	21
2020	18	20
Prior to 2020	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]
2024	25	18
2023	25	22
2022	20	19
2021	19	18
2020	23	18
Prior to 2020	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]
2024	36	40
2023	15	38
2022	13	19
2021	7	9
2020	4	6
Prior to 2020	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]
2024	25	21
2023	8	22
2022	8	10
2021	3	4
2020	2	2
Prior to 2020	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]
2024	2	7
2023	1	3
2022	1	1
2021	0	1
2020	0	0
Prior to 2020	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]
2024	2	1
2023	1	2
2022	0	2
2021	1	0
2020	0	0
Prior to 2020	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]
2024	1	1
2023	0	2
2022	0	1
2021	0	0
2020	0	0
Prior to 2020	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]
2024	1	2
2023	1	1
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	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]
2024	5	8
2023	4	8
2022	4	5
2021	3	4
2020	2	4
Prior to 2020	48	78
Revolving Loans	202	181
Revolving Loans Converted to Term Loans	0	1
Loans and leases	$ 268	$ 289