Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 62,781	$ 61,292
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,909	13,650
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	775	2,130
Financing receivable, originated year two	2,100	2,854
Financing receivable, originated year three	2,792	2,291
Financing receivable, originated year four	2,215	1,043
Financing receivable, originated year five	1,004	706
Financing receivable, originated prior to year five	2,901	2,407
Revolving Loans	2,015	2,101
Revolving Loans Converted to Term Loans	107	118
Loans and leases	13,909	13,650
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	28	80
Financing receivable, originated year two	60	46
Financing receivable, originated year three	33	20
Financing receivable, originated year four	16	16
Financing receivable, originated year five	12	19
Financing receivable, originated prior to year five	152	150
Revolving Loans	440	454
Revolving Loans Converted to Term Loans	10	8
Loans and leases	751	793
FICO score 740 or greater | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	557	1,572
Financing receivable, originated year two	1,550	2,099
Financing receivable, originated year three	2,063	1,720
Financing receivable, originated year four	1,657	730
Financing receivable, originated year five	706	465
Financing receivable, originated prior to year five	1,670	1,332
Revolving Loans	1,448	1,522
Revolving Loans Converted to Term Loans	45	50
Loans and leases	9,696	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	13	52
Financing receivable, originated year two	34	26
Financing receivable, originated year three	18	10
Financing receivable, originated year four	7	5
Financing receivable, originated year five	3	3
Financing receivable, originated prior to year five	25	27
Revolving Loans	191	207
Revolving Loans Converted to Term Loans	7	5
Loans and leases	298	335
FICO score 720-739 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	80	205
Financing receivable, originated year two	203	286
Financing receivable, originated year three	282	227
Financing receivable, originated year four	223	107
Financing receivable, originated year five	105	88
Financing receivable, originated prior to year five	296	230
Revolving Loans	192	192
Revolving Loans Converted to Term Loans	14	15
Loans and leases	1,395	1,350
FICO score 720-739 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	8	5
Financing receivable, originated year two	5	3
Financing receivable, originated year three	2	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	1
Financing receivable, originated prior to year five	5	5
Revolving Loans	21	24
Revolving Loans Converted to Term Loans	1	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	57	154
Financing receivable, originated year two	151	232
Financing receivable, originated year three	223	193
Financing receivable, originated year four	185	81
Financing receivable, originated year five	75	52
Financing receivable, originated prior to year five	264	224
Revolving Loans	155	159
Revolving Loans Converted to Term Loans	16	17
Loans and leases	1,126	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	4	4
Financing receivable, originated year three	3	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	1
Financing receivable, originated prior to year five	4	4
Revolving Loans	22	25
Revolving Loans Converted to Term Loans	1	1
Loans and leases	37	42
FICO score 660-699 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	70	170
Financing receivable, originated year two	166	198
Financing receivable, originated year three	188	113
Financing receivable, originated year four	108	83
Financing receivable, originated year five	79	53
Financing receivable, originated prior to year five	318	290
Revolving Loans	162	168
Revolving Loans Converted to Term Loans	17	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	3	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	7	8
Revolving Loans	21	23
Revolving Loans Converted to Term Loans	0	0
Loans and leases	35	41
FICO score 620-659 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5	11
Financing receivable, originated year two	11	20
Financing receivable, originated year three	17	23
Financing receivable, originated year four	23	22
Financing receivable, originated year five	21	36
Financing receivable, originated prior to year five	132	106
Revolving Loans	34	36
Revolving Loans Converted to Term Loans	5	7
Loans and leases	248	261
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	1
Financing receivable, originated year four	0	0
Financing receivable, originated year five	0	0
Financing receivable, originated prior to year five	2	3
Revolving Loans	6	7
Revolving Loans Converted to Term Loans	0	0
Loans and leases	10	14
FICO score less than 620 | Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	6	18
Financing receivable, originated year two	19	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	221	225
Revolving Loans	24	24
Revolving Loans Converted to Term Loans	10	11
Loans and leases	336	344
FICO score less than 620 | Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4	12
Financing receivable, originated year two	13	9
Financing receivable, originated year three	8	6
Financing receivable, originated year four	6	8
Financing receivable, originated year five	7	13
Financing receivable, originated prior to year five	109	103
Revolving Loans	179	168
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 327	$ 320