Loans and Leases - Balances of Commercial Loan Portfolio Classes, Disaggregated by PD Grade (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 62,565	$ 61,292
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5,780	4,124
Financing receivable, originated year two	2,818	5,832
Financing receivable, originated year three	3,840	3,664
Financing receivable, originated year four	2,562	1,743
Financing receivable, originated year five	1,121	1,805
Financing receivable, originated prior to year five	4,079	3,605
LMC, Non-Revolving Loans	3,471	2,024
Revolving Loans	9,446	9,460
Revolving Loans Converted to Term Loans	311	376
Loans and leases	33,428	32,633
Commercial | Commercial and industrial | PD Grade 1 -12
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5,590	4,008
Financing receivable, originated year two	2,607	5,637
Financing receivable, originated year three	3,649	3,506
Financing receivable, originated year four	2,336	1,636
Financing receivable, originated year five	1,055	1,665
Financing receivable, originated prior to year five	3,853	3,448
LMC, Non-Revolving Loans	3,471	2,019
Revolving Loans	8,784	9,087
Revolving Loans Converted to Term Loans	248	327
Loans and leases	31,593	31,333
Commercial | Commercial and industrial | PD Grades 13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	106	75
Financing receivable, originated year two	27	60
Financing receivable, originated year three	78	64
Financing receivable, originated year four	47	56
Financing receivable, originated year five	33	101
Financing receivable, originated prior to year five	57	57
LMC, Non-Revolving Loans	0	0
Revolving Loans	279	186
Revolving Loans Converted to Term Loans	2	0
Loans and leases	629	599
Commercial | Commercial and industrial | PD Grades 14 15 16
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	84	41
Financing receivable, originated year two	184	135
Financing receivable, originated year three	113	94
Financing receivable, originated year four	179	51
Financing receivable, originated year five	33	39
Financing receivable, originated prior to year five	169	100
LMC, Non-Revolving Loans	0	5
Revolving Loans	383	187
Revolving Loans Converted to Term Loans	61	49
Loans and leases	1,206	701
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,421	14,216
Commercial | Commercial real estate | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	697	858
Financing receivable, originated year two	1,369	3,476
Financing receivable, originated year three	3,813	3,652
Financing receivable, originated year four	3,254	1,259
Financing receivable, originated year five	1,047	1,566
Financing receivable, originated prior to year five	3,847	2,994
Revolving Loans	346	393
Revolving Loans Converted to Term Loans	48	18
Loans and leases	14,421	14,216
Commercial | Commercial real estate | PD Grade 1 -12 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	694	853
Financing receivable, originated year two	1,296	3,473
Financing receivable, originated year three	3,282	3,518
Financing receivable, originated year four	2,778	1,162
Financing receivable, originated year five	894	1,216
Financing receivable, originated prior to year five	3,281	2,853
Revolving Loans	340	393
Revolving Loans Converted to Term Loans	47	18
Loans and leases	12,612	13,486
Commercial | Commercial real estate | PD Grades 13 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	0	5
Financing receivable, originated year two	42	1
Financing receivable, originated year three	280	129
Financing receivable, originated year four	198	86
Financing receivable, originated year five	37	175
Financing receivable, originated prior to year five	130	82
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	1	0
Loans and leases	688	478
Commercial | Commercial real estate | PD Grades 14 15 16 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	3	0
Financing receivable, originated year two	31	2
Financing receivable, originated year three	251	5
Financing receivable, originated year four	278	11
Financing receivable, originated year five	116	175
Financing receivable, originated prior to year five	436	59
Revolving Loans	6	0
Revolving Loans Converted to Term Loans	0	0
Loans and leases	$ 1,121	$ 252