Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 56,529	$ 54,859
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	11,441	10,772
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,764	2,205
Financing receivable, originated year two	2,602	1,690
Financing receivable, originated year three	1,249	1,232
Financing receivable, originated year four	855	763
Financing receivable, originated year five	495	585
Financing receivable, originated prior to year five	2,559	2,333
Revolving Loans	1,742	1,701
Revolving Loans Converted to Term Loans	175	263
Loans and leases	11,441	10,772
Consumer | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,290	1,594
Financing receivable, originated year two	1,928	1,156
Financing receivable, originated year three	878	825
Financing receivable, originated year four	568	473
Financing receivable, originated year five	305	394
Financing receivable, originated prior to year five	1,404	1,335
Revolving Loans	1,100	1,086
Revolving Loans Converted to Term Loans	75	115
Loans and leases	7,548	6,978
Consumer | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	177	236
Financing receivable, originated year two	267	171
Financing receivable, originated year three	120	109
Financing receivable, originated year four	105	61
Financing receivable, originated year five	38	44
Financing receivable, originated prior to year five	250	209
Revolving Loans	172	162
Revolving Loans Converted to Term Loans	21	21
Loans and leases	1,150	1,013
Consumer | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	157	143
Financing receivable, originated year two	220	112
Financing receivable, originated year three	101	81
Financing receivable, originated year four	62	68
Financing receivable, originated year five	40	45
Financing receivable, originated prior to year five	226	153
Revolving Loans	149	141
Revolving Loans Converted to Term Loans	26	23
Loans and leases	981	766
Consumer | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	117	164
Financing receivable, originated year two	141	131
Financing receivable, originated year three	93	120
Financing receivable, originated year four	62	106
Financing receivable, originated year five	66	44
Financing receivable, originated prior to year five	298	246
Revolving Loans	204	204
Revolving Loans Converted to Term Loans	26	44
Loans and leases	1,007	1,059
Consumer | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	10	42
Financing receivable, originated year two	27	36
Financing receivable, originated year three	27	55
Financing receivable, originated year four	45	23
Financing receivable, originated year five	21	13
Financing receivable, originated prior to year five	111	118
Revolving Loans	56	66
Revolving Loans Converted to Term Loans	10	27
Loans and leases	307	380
Consumer | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	13	26
Financing receivable, originated year two	19	84
Financing receivable, originated year three	30	42
Financing receivable, originated year four	13	32
Financing receivable, originated year five	25	45
Financing receivable, originated prior to year five	270	272
Revolving Loans	61	42
Revolving Loans Converted to Term Loans	17	33
Loans and leases	448	576
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	117	131
Financing receivable, originated year two	38	57
Financing receivable, originated year three	30	47
Financing receivable, originated year four	25	44
Financing receivable, originated year five	16	31
Financing receivable, originated prior to year five	27	155
Revolving Loans	606	426
Revolving Loans Converted to Term Loans	11	19
Loans and leases	870	910
Revolving loans converted to term loan during period	1	9
Consumer | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	26	56
Financing receivable, originated year two	20	35
Financing receivable, originated year three	17	29
Financing receivable, originated year four	11	23
Financing receivable, originated year five	4	13
Financing receivable, originated prior to year five	16	56
Revolving Loans	295	200
Revolving Loans Converted to Term Loans	7	11
Loans and leases	396	423
Consumer | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5	14
Financing receivable, originated year two	3	5
Financing receivable, originated year three	2	4
Financing receivable, originated year four	2	3
Financing receivable, originated year five	1	4
Financing receivable, originated prior to year five	1	17
Revolving Loans	39	46
Revolving Loans Converted to Term Loans	1	3
Loans and leases	54	96
Consumer | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4	8
Financing receivable, originated year two	4	5
Financing receivable, originated year three	2	4
Financing receivable, originated year four	1	4
Financing receivable, originated year five	1	3
Financing receivable, originated prior to year five	1	17
Revolving Loans	37	42
Revolving Loans Converted to Term Loans	1	1
Loans and leases	51	84
Consumer | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	8	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	2	31
Revolving Loans	39	98
Revolving Loans Converted to Term Loans	1	2
Loans and leases	57	177
Consumer | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	3	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	1	18
Revolving Loans	19	22
Revolving Loans Converted to Term Loans	0	1
Loans and leases	27	57
Consumer | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	71	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	6	16
Revolving Loans	177	18
Revolving Loans Converted to Term Loans	1	1
Loans and leases	285	73
Consumer | HELOC | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,917	1,964
Revolving loans converted to term loan during period	$ 3	$ 43