Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (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
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,949	7,421
Financing receivable, originated year two	5,260	3,676
Financing receivable, originated year three	2,389	3,556
Financing receivable, originated year four	2,652	1,606
Financing receivable, originated year five	1,349	1,253
Financing receivable, originated prior to year five	3,786	2,358
LMC	3,441	4,518
Revolving Loans	8,843	6,615
Revolving Loans Converted to Term Loans	607	65
Loans and leases	31,276	31,068
Revolving loans converted to term loan during period	0	0
Commercial and industrial | PD Grade 1 -12 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,945	7,372
Financing receivable, originated year two	5,229	3,576
Financing receivable, originated year three	2,354	3,439
Financing receivable, originated year four	2,613	1,455
Financing receivable, originated year five	1,268	1,193
Financing receivable, originated prior to year five	3,611	2,267
LMC	3,441	4,518
Revolving Loans	8,670	6,386
Revolving Loans Converted to Term Loans	498	13
Loans and leases	30,629	30,219
Commercial and industrial | PD Grade 13 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	25
Financing receivable, originated year two	18	39
Financing receivable, originated year three	8	50
Financing receivable, originated year four	35	48
Financing receivable, originated year five	23	36
Financing receivable, originated prior to year five	72	43
LMC	0	0
Revolving Loans	80	100
Revolving Loans Converted to Term Loans	24	4
Loans and leases	260	345
Commercial and industrial | PD Grade 14 ,15 and 16 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4	24
Financing receivable, originated year two	13	61
Financing receivable, originated year three	27	67
Financing receivable, originated year four	4	103
Financing receivable, originated year five	58	24
Financing receivable, originated prior to year five	103	48
LMC	0	0
Revolving Loans	93	129
Revolving Loans Converted to Term Loans	85	48
Loans and leases	387	504
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,942	12,109
Commercial real estate | Commercial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,531	3,492
Financing receivable, originated year two	3,065	2,091
Financing receivable, originated year three	1,651	2,590
Financing receivable, originated year four	2,300	1,057
Financing receivable, originated year five	1,072	744
Financing receivable, originated prior to year five	3,054	1,919
Revolving Loans	254	216
Revolving Loans Converted to Term Loans	15	0
Loans and leases	12,942	12,109
Commercial real estate | PD Grade 1 -12 | Commercial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,531	3,441
Financing receivable, originated year two	3,065	2,065
Financing receivable, originated year three	1,651	2,514
Financing receivable, originated year four	2,300	929
Financing receivable, originated year five	1,071	691
Financing receivable, originated prior to year five	3,035	1,822
Revolving Loans	243	204
Revolving Loans Converted to Term Loans	15	0
Loans and leases	12,911	11,666
Commercial real estate | PD Grade 13 | Commercial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	4
Financing receivable, originated year two	0	26
Financing receivable, originated year three	0	52
Financing receivable, originated year four	0	125
Financing receivable, originated year five	0	20
Financing receivable, originated prior to year five	19	65
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Loans and leases	19	292
Commercial real estate | PD Grade 14 ,15 and 16 | Commercial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	47
Financing receivable, originated year two	0	0
Financing receivable, originated year three	0	24
Financing receivable, originated year four	0	3
Financing receivable, originated year five	1	33
Financing receivable, originated prior to year five	0	32
Revolving Loans	11	12
Revolving Loans Converted to Term Loans	0	0
Loans and leases	$ 12	$ 151