Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 61,295	$ 58,102
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,475	12,253
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,484	2,938
Financing receivable, originated year two	2,894	2,479
Financing receivable, originated year three	2,400	1,175
Financing receivable, originated year four	1,117	784
Financing receivable, originated year five	743	452
Financing receivable, originated prior to year five	2,640	2,397
Revolving Loans	2,065	1,877
Revolving Loans Converted to Term Loans	132	151
Loans and leases	13,475	12,253
Consumer: | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,109	2,154
Financing receivable, originated year two	2,128	1,847
Financing receivable, originated year three	1,788	819
Financing receivable, originated year four	776	523
Financing receivable, originated year five	491	278
Financing receivable, originated prior to year five	1,458	1,294
Revolving Loans	1,495	1,297
Revolving Loans Converted to Term Loans	56	63
Loans and leases	9,301	8,275
Consumer: | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	140	292
Financing receivable, originated year two	290	246
Financing receivable, originated year three	238	116
Financing receivable, originated year four	111	98
Financing receivable, originated year five	94	34
Financing receivable, originated prior to year five	251	238
Revolving Loans	184	183
Revolving Loans Converted to Term Loans	17	18
Loans and leases	1,325	1,225
Consumer: | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	108	242
Financing receivable, originated year two	237	206
Financing receivable, originated year three	197	93
Financing receivable, originated year four	89	55
Financing receivable, originated year five	54	35
Financing receivable, originated prior to year five	242	226
Revolving Loans	153	142
Revolving Loans Converted to Term Loans	18	22
Loans and leases	1,098	1,021
Consumer: | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	115	214
Financing receivable, originated year two	203	137
Financing receivable, originated year three	134	90
Financing receivable, originated year four	85	55
Financing receivable, originated year five	54	62
Financing receivable, originated prior to year five	320	278
Revolving Loans	177	192
Revolving Loans Converted to Term Loans	20	23
Loans and leases	1,108	1,051
Consumer: | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	6	21
Financing receivable, originated year two	20	24
Financing receivable, originated year three	24	25
Financing receivable, originated year four	24	41
Financing receivable, originated year five	38	20
Financing receivable, originated prior to year five	119	105
Revolving Loans	37	47
Revolving Loans Converted to Term Loans	8	9
Loans and leases	276	292
Consumer: | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	6	15
Financing receivable, originated year two	16	19
Financing receivable, originated year three	19	32
Financing receivable, originated year four	32	12
Financing receivable, originated year five	12	23
Financing receivable, originated prior to year five	250	256
Revolving Loans	19	16
Revolving Loans Converted to Term Loans	13	16
Loans and leases	367	389
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	49	53
Financing receivable, originated year two	49	30
Financing receivable, originated year three	32	21
Financing receivable, originated year four	19	23
Financing receivable, originated year five	24	13
Financing receivable, originated prior to year five	163	114
Revolving Loans	467	576
Revolving Loans Converted to Term Loans	10	10
Loans and leases	813	840
Consumer: | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	35	36
Financing receivable, originated year two	29	14
Financing receivable, originated year three	15	10
Financing receivable, originated year four	7	10
Financing receivable, originated year five	8	4
Financing receivable, originated prior to year five	34	25
Revolving Loans	231	291
Revolving Loans Converted to Term Loans	5	6
Loans and leases	364	396
Consumer: | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	3	3
Financing receivable, originated year two	4	2
Financing receivable, originated year three	2	2
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	0
Financing receivable, originated prior to year five	5	4
Revolving Loans	26	30
Revolving Loans Converted to Term Loans	2	1
Loans and leases	44	43
Consumer: | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	3	3
Financing receivable, originated year two	3	3
Financing receivable, originated year three	4	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	0
Financing receivable, originated prior to year five	5	4
Revolving Loans	27	33
Revolving Loans Converted to Term Loans	1	1
Loans and leases	45	46
Consumer: | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	3
Financing receivable, originated year two	3	2
Financing receivable, originated year three	2	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	2
Financing receivable, originated prior to year five	10	7
Revolving Loans	23	30
Revolving Loans Converted to Term Loans	1	1
Loans and leases	43	47
Consumer: | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	1
Financing receivable, originated year two	1	3
Financing receivable, originated year three	2	1
Financing receivable, originated year four	1	0
Financing receivable, originated year five	1	0
Financing receivable, originated prior to year five	3	3
Revolving Loans	6	18
Revolving Loans Converted to Term Loans	0	0
Loans and leases	15	26
Consumer: | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5	7
Financing receivable, originated year two	9	6
Financing receivable, originated year three	7	6
Financing receivable, originated year four	8	10
Financing receivable, originated year five	12	7
Financing receivable, originated prior to year five	106	71
Revolving Loans	154	174
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 302	$ 282