Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 59,045	$ 58,102
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,668	12,253
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	521	2,938
Financing receivable, originated year two	2,933	2,479
Financing receivable, originated year three	2,448	1,175
Financing receivable, originated year four	1,150	784
Financing receivable, originated year five	770	452
Financing receivable, originated prior to year five	2,732	2,397
Revolving Loans	1,973	1,877
Revolving Loans Converted to Term Loans	141	151
Loans and leases	12,668	12,253
Consumer: | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	397	2,154
Financing receivable, originated year two	2,157	1,847
Financing receivable, originated year three	1,822	819
Financing receivable, originated year four	800	523
Financing receivable, originated year five	512	278
Financing receivable, originated prior to year five	1,516	1,294
Revolving Loans	1,383	1,297
Revolving Loans Converted to Term Loans	60	63
Loans and leases	8,647	8,275
Consumer: | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	45	292
Financing receivable, originated year two	292	246
Financing receivable, originated year three	245	116
Financing receivable, originated year four	114	98
Financing receivable, originated year five	97	34
Financing receivable, originated prior to year five	258	238
Revolving Loans	184	183
Revolving Loans Converted to Term Loans	17	18
Loans and leases	1,252	1,225
Consumer: | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	34	242
Financing receivable, originated year two	241	206
Financing receivable, originated year three	202	93
Financing receivable, originated year four	92	55
Financing receivable, originated year five	54	35
Financing receivable, originated prior to year five	249	226
Revolving Loans	151	142
Revolving Loans Converted to Term Loans	21	22
Loans and leases	1,044	1,021
Consumer: | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	42	214
Financing receivable, originated year two	207	137
Financing receivable, originated year three	136	90
Financing receivable, originated year four	88	55
Financing receivable, originated year five	55	62
Financing receivable, originated prior to year five	328	278
Revolving Loans	192	192
Revolving Loans Converted to Term Loans	21	23
Loans and leases	1,069	1,051
Consumer: | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	21
Financing receivable, originated year two	21	24
Financing receivable, originated year three	24	25
Financing receivable, originated year four	25	41
Financing receivable, originated year five	40	20
Financing receivable, originated prior to year five	120	105
Revolving Loans	45	47
Revolving Loans Converted to Term Loans	8	9
Loans and leases	284	292
Consumer: | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	15
Financing receivable, originated year two	15	19
Financing receivable, originated year three	19	32
Financing receivable, originated year four	31	12
Financing receivable, originated year five	12	23
Financing receivable, originated prior to year five	261	256
Revolving Loans	18	16
Revolving Loans Converted to Term Loans	14	16
Loans and leases	372	389
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	12	53
Financing receivable, originated year two	48	30
Financing receivable, originated year three	28	21
Financing receivable, originated year four	16	23
Financing receivable, originated year five	20	13
Financing receivable, originated prior to year five	131	114
Revolving Loans	541	576
Revolving Loans Converted to Term Loans	11	10
Loans and leases	807	840
Consumer: | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	8	36
Financing receivable, originated year two	31	14
Financing receivable, originated year three	14	10
Financing receivable, originated year four	6	10
Financing receivable, originated year five	7	4
Financing receivable, originated prior to year five	28	25
Revolving Loans	252	291
Revolving Loans Converted to Term Loans	8	6
Loans and leases	354	396
Consumer: | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	3
Financing receivable, originated year two	3	2
Financing receivable, originated year three	2	2
Financing receivable, originated year four	2	1
Financing receivable, originated year five	1	0
Financing receivable, originated prior to year five	4	4
Revolving Loans	33	30
Revolving Loans Converted to Term Loans	1	1
Loans and leases	47	43
Consumer: | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	3
Financing receivable, originated year two	3	3
Financing receivable, originated year three	3	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	0
Financing receivable, originated prior to year five	4	4
Revolving Loans	28	33
Revolving Loans Converted to Term Loans	0	1
Loans and leases	41	46
Consumer: | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	3
Financing receivable, originated year two	3	2
Financing receivable, originated year three	1	1
Financing receivable, originated year four	1	1
Financing receivable, originated year five	1	2
Financing receivable, originated prior to year five	8	7
Revolving Loans	31	30
Revolving Loans Converted to Term Loans	1	1
Loans and leases	46	47
Consumer: | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	1
Financing receivable, originated year two	1	3
Financing receivable, originated year three	2	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	14	18
Revolving Loans Converted to Term Loans	0	0
Loans and leases	19	26
Consumer: | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	7
Financing receivable, originated year two	7	6
Financing receivable, originated year three	6	6
Financing receivable, originated year four	6	10
Financing receivable, originated year five	10	7
Financing receivable, originated prior to year five	85	71
Revolving Loans	183	174
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 300	$ 282