Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 58,102	$ 54,859
C&I | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5,916	7,421
Financing receivable, originated year two	4,157	3,676
Financing receivable, originated year three	2,050	3,556
Financing receivable, originated year four	2,278	1,606
Financing receivable, originated year five	1,305	1,253
Financing receivable, originated prior to year five	3,924	2,358
LMC, Non-Revolving Loans	2,258	4,518
Revolving loans	9,425	6,615
Revolving Loans converted to term loans	468	65
Loans and leases	31,781	31,068
C&I | PD Grade 1 -12 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5,856	7,372
Financing receivable, originated year two	4,040	3,576
Financing receivable, originated year three	1,980	3,439
Financing receivable, originated year four	2,099	1,455
Financing receivable, originated year five	1,229	1,193
Financing receivable, originated prior to year five	3,710	2,267
LMC, Non-Revolving Loans	2,258	4,518
Revolving loans	9,165	6,386
Revolving Loans converted to term loans	371	13
Loans and leases	30,708	30,219
C&I | PD Grades 13 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	19	25
Financing receivable, originated year two	63	39
Financing receivable, originated year three	19	50
Financing receivable, originated year four	141	48
Financing receivable, originated year five	9	36
Financing receivable, originated prior to year five	90	43
LMC, Non-Revolving Loans	0	0
Revolving loans	126	100
Revolving Loans converted to term loans	0	4
Loans and leases	467	345
C&I | PD Grades 14 15 16 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	41	24
Financing receivable, originated year two	54	61
Financing receivable, originated year three	51	67
Financing receivable, originated year four	38	103
Financing receivable, originated year five	67	24
Financing receivable, originated prior to year five	124	48
LMC, Non-Revolving Loans	0	0
Revolving loans	134	129
Revolving Loans converted to term loans	97	48
Loans and leases	606	504
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,228	12,109
Commercial real estate | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,638	3,492
Financing receivable, originated year two	3,331	2,091
Financing receivable, originated year three	1,503	2,590
Financing receivable, originated year four	1,942	1,057
Financing receivable, originated year five	907	744
Financing receivable, originated prior to year five	2,601	1,919
Revolving loans	286	216
Revolving Loans converted to term loans	20	0
Loans and leases	13,228	12,109
Commercial real estate | PD Grade 1 -12 | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,637	3,441
Financing receivable, originated year two	3,324	2,065
Financing receivable, originated year three	1,488	2,514
Financing receivable, originated year four	1,855	929
Financing receivable, originated year five	808	691
Financing receivable, originated prior to year five	2,565	1,822
Revolving loans	274	204
Revolving Loans converted to term loans	20	0
Loans and leases	12,971	11,666
Commercial real estate | PD Grades 13 | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	4
Financing receivable, originated year two	3	26
Financing receivable, originated year three	3	52
Financing receivable, originated year four	37	125
Financing receivable, originated year five	68	20
Financing receivable, originated prior to year five	5	65
Revolving loans	1	0
Revolving Loans converted to term loans	0	0
Loans and leases	117	292
Commercial real estate | PD Grades 14 15 16 | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	47
Financing receivable, originated year two	4	0
Financing receivable, originated year three	12	24
Financing receivable, originated year four	50	3
Financing receivable, originated year five	31	33
Financing receivable, originated prior to year five	31	32
Revolving loans	11	12
Revolving Loans converted to term loans	0	0
Loans and leases	$ 140	$ 151