Loans and Leases - Loans by FICO Score, Consumer (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 54,859	$ 58,232
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,772	11,725
Consumer real estate | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,205	1,747
Financing receivable, originated year two	1,690	1,670
Financing receivable, originated year three	1,232	1,093
Financing receivable, originated year four	763	920
Financing receivable, originated year five	585	1,054
Financing receivable, originated prior to year five	2,333	2,821
Revolving loans	1,701	2,055
Revolving Loans converted to term loans	263	365
Loans and leases	10,772	11,725
Consumer real estate | Consumer | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	1,964	2,420
Revolving loans converted to term loan during period	43	36
Consumer real estate | Consumer | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,594	1,186
Financing receivable, originated year two	1,156	1,167
Financing receivable, originated year three	825	703
Financing receivable, originated year four	473	610
Financing receivable, originated year five	394	674
Financing receivable, originated prior to year five	1,335	1,719
Revolving loans	1,086	1,275
Revolving Loans converted to term loans	115	159
Loans and leases	6,978	7,493
Consumer real estate | Consumer | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	236	157
Financing receivable, originated year two	171	158
Financing receivable, originated year three	109	100
Financing receivable, originated year four	61	77
Financing receivable, originated year five	44	92
Financing receivable, originated prior to year five	209	197
Revolving loans	162	186
Revolving Loans converted to term loans	21	29
Loans and leases	1,013	996
Consumer real estate | Consumer | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	143	122
Financing receivable, originated year two	112	107
Financing receivable, originated year three	81	78
Financing receivable, originated year four	68	76
Financing receivable, originated year five	45	73
Financing receivable, originated prior to year five	153	221
Revolving loans	141	177
Revolving Loans converted to term loans	23	34
Loans and leases	766	888
Consumer real estate | Consumer | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	164	130
Financing receivable, originated year two	131	141
Financing receivable, originated year three	120	123
Financing receivable, originated year four	106	75
Financing receivable, originated year five	44	85
Financing receivable, originated prior to year five	246	296
Revolving loans	204	264
Revolving Loans converted to term loans	44	59
Loans and leases	1,059	1,173
Consumer real estate | Consumer | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	42	45
Financing receivable, originated year two	36	61
Financing receivable, originated year three	55	37
Financing receivable, originated year four	23	28
Financing receivable, originated year five	13	35
Financing receivable, originated prior to year five	118	127
Revolving loans	66	92
Revolving Loans converted to term loans	27	36
Loans and leases	380	461
Consumer real estate | Consumer | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	26	107
Financing receivable, originated year two	84	36
Financing receivable, originated year three	42	52
Financing receivable, originated year four	32	54
Financing receivable, originated year five	45	95
Financing receivable, originated prior to year five	272	261
Revolving loans	42	61
Revolving Loans converted to term loans	33	48
Loans and leases	576	714
Credit card and other | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	131	122
Financing receivable, originated year two	57	91
Financing receivable, originated year three	47	107
Financing receivable, originated year four	44	78
Financing receivable, originated year five	31	63
Financing receivable, originated prior to year five	155	279
Revolving loans	426	373
Revolving Loans converted to term loans	19	15
Loans and leases	910	1,128
Revolving loans converted to term loan during period	9
Credit card and other | Consumer | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	56	57
Financing receivable, originated year two	35	52
Financing receivable, originated year three	29	59
Financing receivable, originated year four	23	37
Financing receivable, originated year five	13	23
Financing receivable, originated prior to year five	56	116
Revolving loans	200	159
Revolving Loans converted to term loans	11	5
Loans and leases	423	508
Credit card and other | Consumer | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	14	7
Financing receivable, originated year two	5	7
Financing receivable, originated year three	4	9
Financing receivable, originated year four	3	8
Financing receivable, originated year five	4	8
Financing receivable, originated prior to year five	17	27
Revolving loans	46	91
Revolving Loans converted to term loans	3	2
Loans and leases	96	159
Credit card and other | Consumer | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	8	9
Financing receivable, originated year two	5	8
Financing receivable, originated year three	4	9
Financing receivable, originated year four	4	8
Financing receivable, originated year five	3	4
Financing receivable, originated prior to year five	17	38
Revolving loans	42	37
Revolving Loans converted to term loans	1	3
Loans and leases	84	116
Credit card and other | Consumer | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	25	30
Financing receivable, originated year two	6	12
Financing receivable, originated year three	5	15
Financing receivable, originated year four	6	9
Financing receivable, originated year five	4	9
Financing receivable, originated prior to year five	31	48
Revolving loans	98	46
Revolving Loans converted to term loans	2	3
Loans and leases	177	172
Credit card and other | Consumer | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4	5
Financing receivable, originated year two	3	5
Financing receivable, originated year three	2	7
Financing receivable, originated year four	4	5
Financing receivable, originated year five	3	10
Financing receivable, originated prior to year five	18	24
Revolving loans	22	20
Revolving Loans converted to term loans	1	1
Loans and leases	57	77
Credit card and other | Consumer | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	24	14
Financing receivable, originated year two	3	7
Financing receivable, originated year three	3	8
Financing receivable, originated year four	4	11
Financing receivable, originated year five	4	9
Financing receivable, originated prior to year five	16	26
Revolving loans	18	20
Revolving Loans converted to term loans	1	1
Loans and leases	$ 73	$ 96