Loans and Leases - Balances of Commercial Loan Portfolio Classes, Disaggregated by PD Grade and FICO Score - Current Year (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 64,377	$ 64,156
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	1,299	4,551
2025	4,540	5,265
2024	4,979	2,146
2023	2,050	2,991
2022	2,807	1,931
Prior to 2022	5,866	4,240
LMC	4,641	4,703
Revolving Loans	10,032	9,854
Revolving Loans Converted to Term Loans	253	224
Loans and leases	36,467	35,905
Commercial | Commercial and industrial | PD Grade 1 -12
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	1,284	4,492
2025	4,441	5,124
2024	4,788	2,012
2023	1,881	2,706
2022	2,536	1,749
Prior to 2022	5,465	3,997
LMC	4,614	4,703
Revolving Loans	9,642	9,448
Revolving Loans Converted to Term Loans	239	210
Loans and leases	34,890	34,441
Commercial | Commercial and industrial | PD Grades 13
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	2	7
2025	19	55
2024	79	42
2023	61	78
2022	32	30
Prior to 2022	81	61
LMC	27	0
Revolving Loans	94	123
Revolving Loans Converted to Term Loans	7	6
Loans and leases	402	402
Commercial | Commercial and industrial | PD Grades 14 15 16
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	13	52
2025	80	86
2024	112	92
2023	108	207
2022	239	152
Prior to 2022	320	182
LMC	0	0
Revolving Loans	296	283
Revolving Loans Converted to Term Loans	7	8
Loans and leases	1,175	1,062
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,420	13,563
Commercial | Commercial real estate | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	429	1,372
2025	1,484	1,022
2024	988	1,736
2023	1,717	2,985
2022	2,688	2,117
Prior to 2022	5,713	3,866
Revolving Loans	340	372
Revolving Loans Converted to Term Loans	61	93
Loans and leases	13,420	13,563
Commercial | Commercial real estate | PD Grade 1 -12 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	429	1,362
2025	1,480	1,011
2024	975	1,726
2023	1,600	2,314
2022	2,189	1,873
Prior to 2022	5,128	3,457
Revolving Loans	305	293
Revolving Loans Converted to Term Loans	61	93
Loans and leases	12,167	12,129
Commercial | Commercial real estate | PD Grades 13 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	0	0
2025	0	0
2024	0	1
2023	68	191
2022	92	92
Prior to 2022	85	88
Revolving Loans	3	33
Revolving Loans Converted to Term Loans	0	0
Loans and leases	248	405
Commercial | Commercial real estate | PD Grades 14 15 16 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	0	10
2025	4	11
2024	13	9
2023	49	480
2022	407	152
Prior to 2022	500	321
Revolving Loans	32	46
Revolving Loans Converted to Term Loans	0	0
Loans and leases	1,005	1,029
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]
2026	219	1,259
2025	1,234	1,315
2024	1,233	1,803
2023	1,718	2,480
2022	2,416	1,913
Prior to 2022	4,945	3,174
Revolving Loans	2,017	2,019
Revolving Loans Converted to Term Loans	146	145
Loans and leases	13,928	14,108
Consumer | Consumer Real Estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	156	920
2025	928	922
2024	987	1,330
2023	1,398	1,830
2022	2,033	1,430
Prior to 2022	3,916	1,924
Revolving Loans	1,508	1,551
Revolving Loans Converted to Term Loans	69	75
Loans and leases	10,995	9,982
Consumer | Consumer Real Estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	20	119
2025	97	139
2024	80	173
2023	88	250
2022	112	193
Prior to 2022	267	324
Revolving Loans	154	182
Revolving Loans Converted to Term Loans	12	17
Loans and leases	830	1,397
Consumer | Consumer Real Estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	24	94
2025	69	90
2024	45	125
2023	65	202
2022	85	159
Prior to 2022	210	250
Revolving Loans	137	134
Revolving Loans Converted to Term Loans	11	14
Loans and leases	646	1,068
Consumer | Consumer Real Estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	13	92
2025	84	128
2024	56	145
2023	93	163
2022	113	90
Prior to 2022	248	268
Revolving Loans	141	115
Revolving Loans Converted to Term Loans	22	19
Loans and leases	770	1,020
Consumer | Consumer Real Estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	1	9
2025	27	11
2024	35	10
2023	30	16
2022	26	18
Prior to 2022	115	102
Revolving Loans	36	22
Revolving Loans Converted to Term Loans	9	5
Loans and leases	279	193
Consumer | Consumer Real Estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	5	25
2025	29	25
2024	30	20
2023	44	19
2022	47	23
Prior to 2022	189	306
Revolving Loans	41	15
Revolving Loans Converted to Term Loans	23	15
Loans and leases	408	448
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	6	36
2025	37	15
2024	16	13
2023	14	7
2022	6	4
Prior to 2022	68	58
Revolving Loans	403	437
Revolving Loans Converted to Term Loans	12	10
Loans and leases	562	580
Consumer | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	3	25
2025	25	8
2024	8	8
2023	8	3
2022	3	2
Prior to 2022	14	8
Revolving Loans	199	197
Revolving Loans Converted to Term Loans	6	6
Loans and leases	266	257
Consumer | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	0	2
2025	1	1
2024	1	1
2023	0	0
2022	1	0
Prior to 2022	3	1
Revolving Loans	22	13
Revolving Loans Converted to Term Loans	1	1
Loans and leases	29	19
Consumer | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	0	2
2025	3	1
2024	1	0
2023	1	1
2022	0	0
Prior to 2022	2	0
Revolving Loans	25	12
Revolving Loans Converted to Term Loans	1	1
Loans and leases	33	17
Consumer | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	0	1
2025	1	0
2024	1	0
2023	1	0
2022	0	0
Prior to 2022	3	1
Revolving Loans	24	6
Revolving Loans Converted to Term Loans	2	1
Loans and leases	32	9
Consumer | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	0	1
2025	1	1
2024	1	0
2023	0	0
2022	0	0
Prior to 2022	1	0
Revolving Loans	14	7
Revolving Loans Converted to Term Loans	1	1
Loans and leases	18	10
Consumer | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2026	3	5
2025	6	4
2024	4	4
2023	4	3
2022	2	2
Prior to 2022	45	48
Revolving Loans	119	202
Revolving Loans Converted to Term Loans	1	0
Loans and leases	$ 184	$ 268