Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 60,793	$ 57,648
Total Accruing	60,893	57,786
Current, non-accruing	245	160
Total Non- Accruing	402	316
Loans and leases	61,295	58,102
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	86	105
Past due, non-accruing	38	19
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	14	33
Past due, non-accruing	119	137
Commercial: | Commercial, financial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	32,903	31,567
Total Accruing	32,933	31,628
Current, non-accruing	113	64
Total Non- Accruing	183	153
Loans and leases	33,116	31,781
Commercial: | Commercial, financial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	29	50
Past due, non-accruing	12	10
Commercial: | Commercial, financial and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	11
Past due, non-accruing	58	79
Commercial: | Commercial, financial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	30,212	29,309
Total Accruing	30,242	29,370
Current, non-accruing	113	64
Total Non- Accruing	183	153
Loans and leases	30,425	29,523
Nonaccrual, no allowance	183	147
Commercial: | Commercial, financial and industrial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	29	50
Past due, non-accruing	12	10
Commercial: | Commercial, financial and industrial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	11
Past due, non-accruing	58	79
Commercial: | Commercial, financial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,691	2,258
Total Accruing	2,691	2,258
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	2,691	2,258
Commercial: | Commercial, financial and industrial | Loans to mortgage companies | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Commercial: | Commercial, financial and industrial | Loans to mortgage companies | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Commercial: | Commercial, financial and industrial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	66	5
Commercial: | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,891	13,228
Commercial: | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,891	13,228
Commercial real estate | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,812	13,208
Total Accruing	13,818	13,219
Current, non-accruing	47	7
Total Non- Accruing	73	9
Loans and leases	13,891	13,228
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	6	11
Past due, non-accruing	13	0
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	13	2
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,475	12,253
Consumer: | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,278	12,046
Total Accruing	13,331	12,101
Current, non-accruing	83	88
Total Non- Accruing	144	152
Loans and leases	13,475	12,253
Consumer: | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	45	37
Past due, non-accruing	13	9
Consumer: | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	8	18
Past due, non-accruing	48	55
Consumer: | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,136	1,967
Total Accruing	2,154	1,984
Current, non-accruing	30	32
Total Non- Accruing	43	44
Loans and leases	2,197	2,028
Nonaccrual, no allowance	5	5
Consumer: | Consumer Real Estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	13	12
Past due, non-accruing	4	4
Consumer: | Consumer Real Estate | HELOC | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	5
Past due, non-accruing	9	8
Consumer: | Consumer Real Estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	11,142	10,079
Total Accruing	11,177	10,117
Current, non-accruing	53	56
Total Non- Accruing	101	108
Loans and leases	11,278	10,225
Nonaccrual, no allowance	10	7
Consumer: | Consumer Real Estate | Real estate installment loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	32	25
Past due, non-accruing	9	5
Consumer: | Consumer Real Estate | Real estate installment loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	13
Past due, non-accruing	39	47
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	800	827
Total Accruing	811	838
Current, non-accruing	2	1
Total Non- Accruing	2	2
Loans and leases	813	840
Consumer: | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	6	7
Past due, non-accruing	0	0
Consumer: | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	4
Past due, non-accruing	0	1
Consumer: | Credit Card and Other | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	276	287
Total Accruing	285	296
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	285	296
Consumer: | Credit Card and Other | Credit card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	4	5
Past due, non-accruing	0	0
Consumer: | Credit Card and Other | Credit card | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	4
Past due, non-accruing	0	0
Consumer: | Credit Card and Other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	524	540
Total Accruing	526	542
Current, non-accruing	2	1
Total Non- Accruing	2	2
Loans and leases	528	544
Consumer: | Credit Card and Other | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	2	2
Past due, non-accruing	0	0
Consumer: | Credit Card and Other | Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	$ 0	$ 1