Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 56,930	$ 54,436
Total Accruing	57,062	54,584
Current, non-accruing	150	182
Total Non- Accruing	292	275
Loans and leases	57,354	54,859
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	108	108
Past due, non-accruing	31	7
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	24	40
Past due, non-accruing	111	86
Commercial: | Commercial, financial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	31,438	30,885
Total Accruing	31,504	30,943
Current, non-accruing	49	97
Total Non- Accruing	116	125
Loans and leases	31,620	31,068
Commercial: | Commercial, financial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	65	53
Past due, non-accruing	21	1
Commercial: | Commercial, financial and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	5
Past due, non-accruing	46	27
Commercial: | Commercial, financial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	28,728	26,367
Total Accruing	28,794	26,425
Current, non-accruing	49	97
Total Non- Accruing	116	125
Loans and leases	28,910	26,550
Nonaccrual, no allowance	113	99
Commercial: | Commercial, financial and industrial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	65	53
Past due, non-accruing	21	1
Commercial: | Commercial, financial and industrial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	5
Past due, non-accruing	46	27
Commercial: | Commercial, financial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,710	4,518
Total Accruing	2,710	4,518
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	2,710	4,518
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	5	5
Commercial: | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,021	12,109
Commercial: | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing		12,087
Total Accruing		12,100
Current, non-accruing		6
Total Non- Accruing		9
Loans and leases	13,021	12,109
Commercial: | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing		13
Past due, non-accruing		1
Commercial: | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing		0
Past due, non-accruing		2
Commercial real estate | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,006
Total Accruing	13,011
Current, non-accruing	7
Total Non- Accruing	10
Loans and leases	13,021
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5
Past due, non-accruing	0
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0
Past due, non-accruing	3
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	11,864	10,772
Consumer: | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	11,653	10,564
Total Accruing	11,701	10,634
Current, non-accruing	93	78
Total Non- Accruing	163	138
Loans and leases	11,864	10,772
Consumer: | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	31	37
Past due, non-accruing	9	5
Consumer: | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	17	33
Past due, non-accruing	61	55
Consumer: | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	1,917	1,906
Total Accruing	1,932	1,919
Current, non-accruing	35	34
Total Non- Accruing	45	45
Loans and leases	1,977	1,964
Nonaccrual, no allowance	5	7
Consumer: | Consumer Real Estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	10	7
Past due, non-accruing	2	2
Consumer: | Consumer Real Estate | HELOC | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	6
Past due, non-accruing	8	9
Consumer: | Consumer Real Estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	9,736	8,658
Total Accruing	9,769	8,715
Current, non-accruing	58	44
Total Non- Accruing	118	93
Loans and leases	9,887	8,808
Nonaccrual, no allowance	7	50
Consumer: | Consumer Real Estate | Real estate installment loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	21	30
Past due, non-accruing	7	3
Consumer: | Consumer Real Estate | Real estate installment loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	12	27
Past due, non-accruing	53	46
Consumer: | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	833	900
Total Accruing	846	907
Current, non-accruing	1	1
Total Non- Accruing	3	3
Loans and leases	849	910
Consumer: | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	7	5
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	6	2
Past due, non-accruing	1	2
Consumer: | Credit Card and Other | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	256	292
Total Accruing	267	296
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	267	296
Consumer: | Credit Card and Other | Credit card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	2
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	6	2
Past due, non-accruing	0	0
Consumer: | Credit Card and Other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	577	608
Total Accruing	579	611
Current, non-accruing	1	1
Total Non- Accruing	3	3
Loans and leases	582	614
Consumer: | Credit Card and Other | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	2	3
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	$ 1	$ 2