Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 61,295	$ 58,102
Commercial and industrial | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,120	5,916
Financing receivable, originated year two	5,871	4,157
Financing receivable, originated year three	3,925	2,050
Financing receivable, originated year four	1,806	2,278
Financing receivable, originated year five	2,019	1,305
Financing receivable, originated prior to year five	4,734	3,924
LMC	2,691	2,258
Revolving Loans	9,522	9,425
Revolving Loans Converted to Term Loans	428	468
Loans and leases	33,116	31,781
Commercial and industrial | PD Grade 1 -12 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,015	5,856
Financing receivable, originated year two	5,762	4,040
Financing receivable, originated year three	3,829	1,980
Financing receivable, originated year four	1,686	2,099
Financing receivable, originated year five	1,876	1,229
Financing receivable, originated prior to year five	4,462	3,710
LMC	2,691	2,258
Revolving Loans	9,250	9,165
Revolving Loans Converted to Term Loans	323	371
Loans and leases	31,894	30,708
Commercial and industrial | PD Grade 13 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	19
Financing receivable, originated year two	41	63
Financing receivable, originated year three	36	19
Financing receivable, originated year four	60	141
Financing receivable, originated year five	102	9
Financing receivable, originated prior to year five	77	90
LMC	0	0
Revolving Loans	116	126
Revolving Loans Converted to Term Loans	1	0
Loans and leases	433	467
Commercial and industrial | PD Grade 14 ,15 and 16 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	105	41
Financing receivable, originated year two	68	54
Financing receivable, originated year three	60	51
Financing receivable, originated year four	60	38
Financing receivable, originated year five	41	67
Financing receivable, originated prior to year five	195	124
LMC	0	0
Revolving Loans	156	134
Revolving Loans Converted to Term Loans	104	97
Loans and leases	789	606
Commercial real estate | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,891	13,228
Commercial real estate | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	488	2,638
Financing receivable, originated year two	3,131	3,331
Financing receivable, originated year three	3,625	1,503
Financing receivable, originated year four	1,361	1,942
Financing receivable, originated year five	1,753	907
Financing receivable, originated prior to year five	3,242	2,601
Revolving Loans	272	286
Revolving Loans Converted to Term Loans	19	20
Loans and leases	13,891	13,228
Commercial real estate | PD Grade 1 -12 | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	488	2,637
Financing receivable, originated year two	3,127	3,324
Financing receivable, originated year three	3,618	1,488
Financing receivable, originated year four	1,349	1,855
Financing receivable, originated year five	1,512	808
Financing receivable, originated prior to year five	3,112	2,565
Revolving Loans	264	274
Revolving Loans Converted to Term Loans	19	20
Loans and leases	13,489	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	2	3
Financing receivable, originated year three	2	3
Financing receivable, originated year four	0	37
Financing receivable, originated year five	136	68
Financing receivable, originated prior to year five	56	5
Revolving Loans	0	1
Revolving Loans Converted to Term Loans	0	0
Loans and leases	196	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	2	4
Financing receivable, originated year three	5	12
Financing receivable, originated year four	12	50
Financing receivable, originated year five	105	31
Financing receivable, originated prior to year five	74	31
Revolving Loans	8	11
Revolving Loans Converted to Term Loans	0	0
Loans and leases	$ 206	$ 140