Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 57,354	$ 54,859
Commercial and industrial | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4,583	7,421
Financing receivable, originated year two	4,471	3,676
Financing receivable, originated year three	2,133	3,556
Financing receivable, originated year four	2,464	1,606
Financing receivable, originated year five	1,387	1,253
Financing receivable, originated prior to year five	4,145	2,358
LMC	2,710	4,518
Revolving Loans	9,228	6,615
Revolving Loans Converted to Term Loans	499	65
Loans and leases	31,620	31,068
Commercial and industrial | PD Grade 1 -12 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4,518	7,372
Financing receivable, originated year two	4,415	3,576
Financing receivable, originated year three	2,051	3,439
Financing receivable, originated year four	2,357	1,455
Financing receivable, originated year five	1,300	1,193
Financing receivable, originated prior to year five	3,947	2,267
LMC	2,710	4,518
Revolving Loans	9,006	6,386
Revolving Loans Converted to Term Loans	399	13
Loans and leases	30,703	30,219
Commercial and industrial | PD Grade 13 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	29	25
Financing receivable, originated year two	24	39
Financing receivable, originated year three	11	50
Financing receivable, originated year four	73	48
Financing receivable, originated year five	9	36
Financing receivable, originated prior to year five	68	43
LMC	0	0
Revolving Loans	96	100
Revolving Loans Converted to Term Loans	3	4
Loans and leases	313	345
Commercial and industrial | PD Grade 14 ,15 and 16 | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	36	24
Financing receivable, originated year two	32	61
Financing receivable, originated year three	71	67
Financing receivable, originated year four	34	103
Financing receivable, originated year five	78	24
Financing receivable, originated prior to year five	130	48
LMC	0	0
Revolving Loans	126	129
Revolving Loans Converted to Term Loans	97	48
Loans and leases	604	504
Commercial real estate | Commercial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,021	12,109
Commercial real estate | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,100	3,492
Financing receivable, originated year two	3,264	2,091
Financing receivable, originated year three	1,561	2,590
Financing receivable, originated year four	2,076	1,057
Financing receivable, originated year five	1,005	744
Financing receivable, originated prior to year five	2,732	1,919
Revolving Loans	263	216
Revolving Loans Converted to Term Loans	20	0
Loans and leases	13,021	12,109
Commercial real estate | PD Grade 1 -12 | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,099	3,441
Financing receivable, originated year two	3,260	2,065
Financing receivable, originated year three	1,547	2,514
Financing receivable, originated year four	1,969	929
Financing receivable, originated year five	881	691
Financing receivable, originated prior to year five	2,687	1,822
Revolving Loans	251	204
Revolving Loans Converted to Term Loans	20	0
Loans and leases	12,714	11,666
Commercial real estate | PD Grade 13 | Commercial: | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1	4
Financing receivable, originated year two	1	26
Financing receivable, originated year three	2	52
Financing receivable, originated year four	45	125
Financing receivable, originated year five	98	20
Financing receivable, originated prior to year five	9	65
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Loans and leases	156	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	3	0
Financing receivable, originated year three	12	24
Financing receivable, originated year four	62	3
Financing receivable, originated year five	26	33
Financing receivable, originated prior to year five	36	32
Revolving Loans	12	12
Revolving Loans Converted to Term Loans	0	0
Loans and leases	$ 151	$ 151