Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 62,215	$ 62,565
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,089	14,047
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	292	1,454
Financing receivable, originated year two	1,437	2,022
Financing receivable, originated year three	1,987	2,715
Financing receivable, originated year four	2,670	2,119
Financing receivable, originated year five	2,077	959
Financing receivable, originated prior to year five	3,531	2,686
Revolving Loans	1,962	1,956
Revolving Loans Converted to Term Loans	133	136
Loans and leases	14,089	14,047
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	10	40
Financing receivable, originated year two	34	38
Financing receivable, originated year three	30	19
Financing receivable, originated year four	15	9
Financing receivable, originated year five	7	6
Financing receivable, originated prior to year five	97	106
Revolving Loans	423	436
Revolving Loans Converted to Term Loans	17	15
Loans and leases	633	669
FICO score 740 or greater | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	220	1,045
Financing receivable, originated year two	1,028	1,493
Financing receivable, originated year three	1,469	2,009
Financing receivable, originated year four	1,974	1,592
Financing receivable, originated year five	1,559	675
Financing receivable, originated prior to year five	2,150	1,554
Revolving Loans	1,433	1,430
Revolving Loans Converted to Term Loans	54	56
Loans and leases	9,887	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	7	21
Financing receivable, originated year two	17	22
Financing receivable, originated year three	18	10
Financing receivable, originated year four	7	4
Financing receivable, originated year five	4	2
Financing receivable, originated prior to year five	18	19
Revolving Loans	190	197
Revolving Loans Converted to Term Loans	13	8
Loans and leases	274	283
FICO score 720-739 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	25	149
Financing receivable, originated year two	146	197
Financing receivable, originated year three	192	270
Financing receivable, originated year four	266	213
Financing receivable, originated year five	209	99
Financing receivable, originated prior to year five	364	271
Revolving Loans	178	175
Revolving Loans Converted to Term Loans	17	17
Loans and leases	1,397	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	7	3
Financing receivable, originated year three	2	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	3	3
Revolving Loans	21	20
Revolving Loans Converted to Term Loans	2	2
Loans and leases	37	37
FICO score 700-719 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	15	98
Financing receivable, originated year two	98	140
Financing receivable, originated year three	139	217
Financing receivable, originated year four	213	175
Financing receivable, originated year five	172	72
Financing receivable, originated prior to year five	305	242
Revolving Loans	145	150
Revolving Loans Converted to Term Loans	18	18
Loans and leases	1,105	1,112
FICO score 700-719 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	1
Financing receivable, originated year two	1	2
Financing receivable, originated year three	1	2
Financing receivable, originated year four	1	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	2	2
Revolving Loans	12	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	28	133
Financing receivable, originated year two	132	160
Financing receivable, originated year three	158	183
Financing receivable, originated year four	181	100
Financing receivable, originated year five	99	75
Financing receivable, originated prior to year five	361	294
Revolving Loans	147	146
Revolving Loans Converted to Term Loans	24	25
Loans and leases	1,130	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	1	2
Financing receivable, originated year three	1	1
Financing receivable, originated year four	1	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	2	3
Revolving Loans	15	15
Revolving Loans Converted to Term Loans	1	4
Loans and leases	22	26
FICO score 620-659 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	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	20	20
Financing receivable, originated prior to year five	140	122
Revolving Loans	30	30
Revolving Loans Converted to Term Loans	10	9
Loans and leases	240	240
FICO score 620-659 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	2
Financing receivable, originated year two	1	1
Financing receivable, originated year three	1	0
Financing receivable, originated year four	0	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	1	1
Revolving Loans	8	9
Revolving Loans Converted to Term Loans	0	0
Loans and leases	11	13
FICO score less than 620 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	18
Financing receivable, originated year two	22	22
Financing receivable, originated year three	19	19
Financing receivable, originated year four	19	18
Financing receivable, originated year five	18	18
Financing receivable, originated prior to year five	211	203
Revolving Loans	29	25
Revolving Loans Converted to Term Loans	10	11
Loans and leases	330	334
FICO score less than 620 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	8
Financing receivable, originated year two	7	8
Financing receivable, originated year three	7	5
Financing receivable, originated year four	5	4
Financing receivable, originated year five	3	4
Financing receivable, originated prior to year five	71	78
Revolving Loans	177	181
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 272	$ 289