Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 62,445	$ 61,292
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,961	13,650
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,117	2,130
Financing receivable, originated year two	2,063	2,854
Financing receivable, originated year three	2,758	2,291
Financing receivable, originated year four	2,170	1,043
Financing receivable, originated year five	979	706
Financing receivable, originated prior to year five	2,789	2,407
Revolving Loans	1,942	2,101
Revolving Loans Converted to Term Loans	143	118
Loans and leases	13,961	13,650
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	41	80
Financing receivable, originated year two	49	46
Financing receivable, originated year three	25	20
Financing receivable, originated year four	12	16
Financing receivable, originated year five	9	19
Financing receivable, originated prior to year five	105	150
Revolving Loans	437	454
Revolving Loans Converted to Term Loans	9	8
Loans and leases	687	793
FICO score 740 or greater | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	803	1,572
Financing receivable, originated year two	1,524	2,099
Financing receivable, originated year three	2,043	1,720
Financing receivable, originated year four	1,623	730
Financing receivable, originated year five	690	465
Financing receivable, originated prior to year five	1,611	1,332
Revolving Loans	1,419	1,522
Revolving Loans Converted to Term Loans	57	50
Loans and leases	9,770	9,490
FICO score 740 or greater | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	21	52
Financing receivable, originated year two	29	26
Financing receivable, originated year three	13	10
Financing receivable, originated year four	6	5
Financing receivable, originated year five	3	3
Financing receivable, originated prior to year five	23	27
Revolving Loans	194	207
Revolving Loans Converted to Term Loans	6	5
Loans and leases	295	335
FICO score 720-739 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	118	205
Financing receivable, originated year two	198	286
Financing receivable, originated year three	274	227
Financing receivable, originated year four	218	107
Financing receivable, originated year five	100	88
Financing receivable, originated prior to year five	283	230
Revolving Loans	177	192
Revolving Loans Converted to Term Loans	18	15
Loans and leases	1,386	1,350
FICO score 720-739 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	9	5
Financing receivable, originated year two	4	3
Financing receivable, originated year three	2	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	0	1
Financing receivable, originated prior to year five	4	5
Revolving Loans	22	24
Revolving Loans Converted to Term Loans	2	1
Loans and leases	44	41
FICO score 700-719 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	76	154
Financing receivable, originated year two	143	232
Financing receivable, originated year three	220	193
Financing receivable, originated year four	183	81
Financing receivable, originated year five	74	52
Financing receivable, originated prior to year five	255	224
Revolving Loans	147	159
Revolving Loans Converted to Term Loans	20	17
Loans and leases	1,118	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	5
Financing receivable, originated year two	2	4
Financing receivable, originated year three	2	1
Financing receivable, originated year four	0	1
Financing receivable, originated year five	0	1
Financing receivable, originated prior to year five	3	4
Revolving Loans	14	25
Revolving Loans Converted to Term Loans	0	1
Loans and leases	22	42
FICO score 660-699 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	100	170
Financing receivable, originated year two	166	198
Financing receivable, originated year three	185	113
Financing receivable, originated year four	105	83
Financing receivable, originated year five	76	53
Financing receivable, originated prior to year five	303	290
Revolving Loans	146	168
Revolving Loans Converted to Term Loans	27	18
Loans and leases	1,108	1,093
FICO score 660-699 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	4
Financing receivable, originated year two	2	3
Financing receivable, originated year three	1	1
Financing receivable, originated year four	0	1
Financing receivable, originated year five	0	1
Financing receivable, originated prior to year five	4	8
Revolving Loans	19	23
Revolving Loans Converted to Term Loans	0	0
Loans and leases	27	41
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	20
Financing receivable, originated year three	17	23
Financing receivable, originated year four	22	22
Financing receivable, originated year five	21	36
Financing receivable, originated prior to year five	127	106
Revolving Loans	31	36
Revolving Loans Converted to Term Loans	9	7
Loans and leases	246	261
FICO score 620-659 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	2
Financing receivable, originated year two	1	1
Financing receivable, originated year three	0	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	7
Revolving Loans Converted to Term Loans	0	0
Loans and leases	13	14
FICO score less than 620 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	12	18
Financing receivable, originated year two	21	19
Financing receivable, originated year three	19	15
Financing receivable, originated year four	19	20
Financing receivable, originated year five	18	12
Financing receivable, originated prior to year five	210	225
Revolving Loans	22	24
Revolving Loans Converted to Term Loans	12	11
Loans and leases	333	344
FICO score less than 620 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	7	12
Financing receivable, originated year two	11	9
Financing receivable, originated year three	7	6
Financing receivable, originated year four	5	8
Financing receivable, originated year five	6	13
Financing receivable, originated prior to year five	70	103
Revolving Loans	179	168
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 286	$ 320