Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 57,354	$ 54,859
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	11,864	10,772
Consumer: | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,392	2,205
Financing receivable, originated year two	2,518	1,690
Financing receivable, originated year three	1,193	1,232
Financing receivable, originated year four	810	763
Financing receivable, originated year five	464	585
Financing receivable, originated prior to year five	2,510	2,333
Revolving Loans	1,816	1,701
Revolving Loans Converted to Term Loans	161	263
Loans and leases	11,864	10,772
Consumer: | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,743	1,594
Financing receivable, originated year two	1,873	1,156
Financing receivable, originated year three	833	825
Financing receivable, originated year four	541	473
Financing receivable, originated year five	284	394
Financing receivable, originated prior to year five	1,354	1,335
Revolving Loans	1,208	1,086
Revolving Loans Converted to Term Loans	68	115
Loans and leases	7,904	6,978
Consumer: | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	235	236
Financing receivable, originated year two	254	171
Financing receivable, originated year three	118	109
Financing receivable, originated year four	100	61
Financing receivable, originated year five	35	44
Financing receivable, originated prior to year five	247	209
Revolving Loans	174	162
Revolving Loans Converted to Term Loans	19	21
Loans and leases	1,182	1,013
Consumer: | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	209	143
Financing receivable, originated year two	210	112
Financing receivable, originated year three	94	81
Financing receivable, originated year four	58	68
Financing receivable, originated year five	38	45
Financing receivable, originated prior to year five	234	153
Revolving Loans	140	141
Revolving Loans Converted to Term Loans	23	23
Loans and leases	1,006	766
Consumer: | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	175	164
Financing receivable, originated year two	138	131
Financing receivable, originated year three	91	120
Financing receivable, originated year four	57	106
Financing receivable, originated year five	63	44
Financing receivable, originated prior to year five	296	246
Revolving Loans	195	204
Revolving Loans Converted to Term Loans	25	44
Loans and leases	1,040	1,059
Consumer: | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	15	42
Financing receivable, originated year two	25	36
Financing receivable, originated year three	26	55
Financing receivable, originated year four	42	23
Financing receivable, originated year five	20	13
Financing receivable, originated prior to year five	110	118
Revolving Loans	50	66
Revolving Loans Converted to Term Loans	10	27
Loans and leases	298	380
Consumer: | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	15	26
Financing receivable, originated year two	18	84
Financing receivable, originated year three	31	42
Financing receivable, originated year four	12	32
Financing receivable, originated year five	24	45
Financing receivable, originated prior to year five	269	272
Revolving Loans	49	42
Revolving Loans Converted to Term Loans	16	33
Loans and leases	434	576
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	40	131
Financing receivable, originated year two	34	57
Financing receivable, originated year three	24	47
Financing receivable, originated year four	23	44
Financing receivable, originated year five	15	31
Financing receivable, originated prior to year five	112	155
Revolving Loans	591	426
Revolving Loans Converted to Term Loans	10	19
Loans and leases	849	910
Consumer: | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	25	56
Financing receivable, originated year two	17	35
Financing receivable, originated year three	12	29
Financing receivable, originated year four	10	23
Financing receivable, originated year five	4	13
Financing receivable, originated prior to year five	25	56
Revolving Loans	290	200
Revolving Loans Converted to Term Loans	7	11
Loans and leases	390	423
Consumer: | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	3	14
Financing receivable, originated year two	2	5
Financing receivable, originated year three	2	4
Financing receivable, originated year four	1	3
Financing receivable, originated year five	1	4
Financing receivable, originated prior to year five	5	17
Revolving Loans	33	46
Revolving Loans Converted to Term Loans	1	3
Loans and leases	48	96
Consumer: | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	8
Financing receivable, originated year two	4	5
Financing receivable, originated year three	1	4
Financing receivable, originated year four	1	4
Financing receivable, originated year five	0	3
Financing receivable, originated prior to year five	4	17
Revolving Loans	37	42
Revolving Loans Converted to Term Loans	0	1
Loans and leases	49	84
Consumer: | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2	25
Financing receivable, originated year two	2	6
Financing receivable, originated year three	2	5
Financing receivable, originated year four	1	6
Financing receivable, originated year five	2	4
Financing receivable, originated prior to year five	7	31
Revolving Loans	35	98
Revolving Loans Converted to Term Loans	1	2
Loans and leases	52	177
Consumer: | Credit Card and Other | FICO score 620-659
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	2
Financing receivable, originated year four	0	4
Financing receivable, originated year five	1	3
Financing receivable, originated prior to year five	3	18
Revolving Loans	21	22
Revolving Loans Converted to Term Loans	0	1
Loans and leases	29	57
Consumer: | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	7	24
Financing receivable, originated year two	7	3
Financing receivable, originated year three	6	3
Financing receivable, originated year four	10	4
Financing receivable, originated year five	7	4
Financing receivable, originated prior to year five	68	16
Revolving Loans	175	18
Revolving Loans Converted to Term Loans	1	1
Loans and leases	$ 281	$ 73