Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 58,530	$ 57,648
Total Accruing	58,621	57,786
Current, non-accruing	236	160
Total Non- Accruing	424	316
Loans and leases	59,045	58,102
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	79	105
Past due, non-accruing	50	19
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	12	33
Past due, non-accruing	138	137
Commercial: | Commercial, financial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	31,942	31,567
Total Accruing	31,968	31,628
Current, non-accruing	127	64
Total Non- Accruing	204	153
Loans and leases	32,172	31,781
Commercial: | Commercial, financial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	26	50
Past due, non-accruing	6	10
Commercial: | Commercial, financial and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	11
Past due, non-accruing	71	79
Commercial: | Commercial, financial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	29,902	29,309
Total Accruing	29,928	29,370
Current, non-accruing	127	64
Total Non- Accruing	204	153
Loans and leases	30,132	29,523
Nonaccrual, no allowance	204	147
Commercial: | Commercial, financial and industrial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	26	50
Past due, non-accruing	6	10
Commercial: | Commercial, financial and industrial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	11
Past due, non-accruing	71	79
Commercial: | Commercial, financial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,040	2,258
Total Accruing	2,040	2,258
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	2,040	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	55	5
Commercial: | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,398	13,228
Commercial: | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,398	13,228
Commercial real estate | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,330	13,208
Total Accruing	13,335	13,219
Current, non-accruing	19	7
Total Non- Accruing	63	9
Loans and leases	13,398	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	5	11
Past due, non-accruing	26	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	18	2
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,668	12,253
Consumer: | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	12,464	12,046
Total Accruing	12,513	12,101
Current, non-accruing	89	88
Total Non- Accruing	155	152
Loans and leases	12,668	12,253
Consumer: | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	42	37
Past due, non-accruing	17	9
Consumer: | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	7	18
Past due, non-accruing	49	55
Consumer: | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,049	1,967
Total Accruing	2,069	1,984
Current, non-accruing	33	32
Total Non- Accruing	45	44
Loans and leases	2,114	2,028
Nonaccrual, no allowance	7	5
Consumer: | Consumer Real Estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	15	12
Past due, non-accruing	5	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	7	8
Consumer: | Consumer Real Estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	10,415	10,079
Total Accruing	10,444	10,117
Current, non-accruing	56	56
Total Non- Accruing	110	108
Loans and leases	10,554	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	27	25
Past due, non-accruing	12	5
Consumer: | Consumer Real Estate | Real estate installment loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	2	13
Past due, non-accruing	42	47
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	794	827
Total Accruing	805	838
Current, non-accruing	1	1
Total Non- Accruing	2	2
Loans and leases	807	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	1	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	286	287
Total Accruing	295	296
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	295	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	508	540
Total Accruing	510	542
Current, non-accruing	1	1
Total Non- Accruing	2	2
Loans and leases	512	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	1	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