Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 59,045	$ 58,102
Commercial and industrial | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	930	5,916
Financing receivable, originated year two	5,872	4,157
Financing receivable, originated year three	4,093	2,050
Financing receivable, originated year four	1,949	2,278
Financing receivable, originated year five	2,166	1,305
Financing receivable, originated prior to year five	4,993	3,924
LMC	2,040	2,258
Revolving Loans	9,692	9,425
Revolving Loans Converted to Term Loans	437	468
Loans and leases	32,172	31,781
Commercial and industrial | PD Grade 1 -12 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	893	5,856
Financing receivable, originated year two	5,814	4,040
Financing receivable, originated year three	3,977	1,980
Financing receivable, originated year four	1,800	2,099
Financing receivable, originated year five	1,995	1,229
Financing receivable, originated prior to year five	4,717	3,710
LMC	2,040	2,258
Revolving Loans	9,411	9,165
Revolving Loans Converted to Term Loans	351	371
Loans and leases	30,998	30,708
Commercial and industrial | PD Grade 13 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	19
Financing receivable, originated year two	24	63
Financing receivable, originated year three	59	19
Financing receivable, originated year four	17	141
Financing receivable, originated year five	128	9
Financing receivable, originated prior to year five	87	90
LMC	0	0
Revolving Loans	177	126
Revolving Loans Converted to Term Loans	1	0
Loans and leases	494	467
Commercial and industrial | PD Grade 14 ,15 and 16 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	36	41
Financing receivable, originated year two	34	54
Financing receivable, originated year three	57	51
Financing receivable, originated year four	132	38
Financing receivable, originated year five	43	67
Financing receivable, originated prior to year five	189	124
LMC	0	0
Revolving Loans	104	134
Revolving Loans Converted to Term Loans	85	97
Loans and leases	680	606
Commercial real estate | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,398	13,228
Commercial real estate | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	240	2,638
Financing receivable, originated year two	2,847	3,331
Financing receivable, originated year three	3,447	1,503
Financing receivable, originated year four	1,399	1,942
Financing receivable, originated year five	1,837	907
Financing receivable, originated prior to year five	3,367	2,601
Revolving Loans	242	286
Revolving Loans Converted to Term Loans	19	20
Loans and leases	13,398	13,228
Commercial real estate | PD Grade 1 -12 | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	240	2,637
Financing receivable, originated year two	2,846	3,324
Financing receivable, originated year three	3,442	1,488
Financing receivable, originated year four	1,386	1,855
Financing receivable, originated year five	1,704	808
Financing receivable, originated prior to year five	3,251	2,565
Revolving Loans	233	274
Revolving Loans Converted to Term Loans	19	20
Loans and leases	13,121	12,971
Commercial real estate | PD Grade 13 | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	0
Financing receivable, originated year two	0	3
Financing receivable, originated year three	1	3
Financing receivable, originated year four	2	37
Financing receivable, originated year five	85	68
Financing receivable, originated prior to year five	57	5
Revolving Loans	0	1
Revolving Loans Converted to Term Loans	0	0
Loans and leases	145	117
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	1
Financing receivable, originated year two	1	4
Financing receivable, originated year three	4	12
Financing receivable, originated year four	11	50
Financing receivable, originated year five	48	31
Financing receivable, originated prior to year five	59	31
Revolving Loans	9	11
Revolving Loans Converted to Term Loans	0	0
Loans and leases	$ 132	$ 140