Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 63,058	$ 62,565
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,403	14,047
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,206	1,454
Financing receivable, originated year two	1,363	2,022
Financing receivable, originated year three	1,882	2,715
Financing receivable, originated year four	2,543	2,119
Financing receivable, originated year five	1,969	959
Financing receivable, originated prior to year five	3,295	2,686
Revolving Loans	2,005	1,956
Revolving Loans Converted to Term Loans	140	136
Loans and leases	14,403	14,047
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	29	40
Financing receivable, originated year two	18	38
Financing receivable, originated year three	16	19
Financing receivable, originated year four	9	9
Financing receivable, originated year five	4	6
Financing receivable, originated prior to year five	67	106
Revolving Loans	425	436
Revolving Loans Converted to Term Loans	11	15
Loans and leases	579	669
FICO score 740 or greater | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	895	1,045
Financing receivable, originated year two	961	1,493
Financing receivable, originated year three	1,392	2,009
Financing receivable, originated year four	1,877	1,592
Financing receivable, originated year five	1,474	675
Financing receivable, originated prior to year five	1,994	1,554
Revolving Loans	1,534	1,430
Revolving Loans Converted to Term Loans	69	56
Loans and leases	10,196	9,854
FICO score 740 or greater | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	20	21
Financing receivable, originated year two	10	22
Financing receivable, originated year three	9	10
Financing receivable, originated year four	4	4
Financing receivable, originated year five	2	2
Financing receivable, originated prior to year five	9	19
Revolving Loans	173	197
Revolving Loans Converted to Term Loans	7	8
Loans and leases	234	283
FICO score 720-739 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	112	149
Financing receivable, originated year two	141	197
Financing receivable, originated year three	184	270
Financing receivable, originated year four	259	213
Financing receivable, originated year five	196	99
Financing receivable, originated prior to year five	333	271
Revolving Loans	177	175
Revolving Loans Converted to Term Loans	17	17
Loans and leases	1,419	1,391
FICO score 720-739 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	7
Financing receivable, originated year two	1	3
Financing receivable, originated year three	1	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	1	3
Revolving Loans	12	20
Revolving Loans Converted to Term Loans	2	2
Loans and leases	19	37
FICO score 700-719 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	84	98
Financing receivable, originated year two	94	140
Financing receivable, originated year three	131	217
Financing receivable, originated year four	204	175
Financing receivable, originated year five	164	72
Financing receivable, originated prior to year five	259	242
Revolving Loans	133	150
Revolving Loans Converted to Term Loans	14	18
Loans and leases	1,083	1,112
FICO score 700-719 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	1
Financing receivable, originated year two	1	2
Financing receivable, originated year three	0	2
Financing receivable, originated year four	1	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	1	2
Revolving Loans	13	14
Revolving Loans Converted to Term Loans	0	0
Loans and leases	17	21
FICO score 660-699 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	90	133
Financing receivable, originated year two	130	160
Financing receivable, originated year three	146	183
Financing receivable, originated year four	167	100
Financing receivable, originated year five	94	75
Financing receivable, originated prior to year five	283	294
Revolving Loans	114	146
Revolving Loans Converted to Term Loans	19	25
Loans and leases	1,043	1,116
FICO score 660-699 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	1
Financing receivable, originated year two	0	2
Financing receivable, originated year three	1	1
Financing receivable, originated year four	0	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	1	3
Revolving Loans	9	15
Revolving Loans Converted to Term Loans	1	4
Loans and leases	13	26
FICO score 620-659 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	8	11
Financing receivable, originated year two	11	10
Financing receivable, originated year three	10	17
Financing receivable, originated year four	17	21
Financing receivable, originated year five	18	20
Financing receivable, originated prior to year five	105	122
Revolving Loans	22	30
Revolving Loans Converted to Term Loans	6	9
Loans and leases	197	240
FICO score 620-659 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	2
Financing receivable, originated year two	1	1
Financing receivable, originated year three	0	0
Financing receivable, originated year four	0	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	0	1
Revolving Loans	8	9
Revolving Loans Converted to Term Loans	0	0
Loans and leases	10	13
FICO score less than 620 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	17	18
Financing receivable, originated year two	26	22
Financing receivable, originated year three	19	19
Financing receivable, originated year four	19	18
Financing receivable, originated year five	23	18
Financing receivable, originated prior to year five	321	203
Revolving Loans	25	25
Revolving Loans Converted to Term Loans	15	11
Loans and leases	465	334
FICO score less than 620 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5	8
Financing receivable, originated year two	5	8
Financing receivable, originated year three	5	5
Financing receivable, originated year four	3	4
Financing receivable, originated year five	2	4
Financing receivable, originated prior to year five	55	78
Revolving Loans	210	181
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 286	$ 289