Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 56,105	$ 54,436
Total Accruing	56,228	54,584
Current, non-accruing	181	182
Total Non- Accruing	301	275
Loans and leases	56,529	54,859
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	106	108
Past due, non-accruing	11	7
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	17	40
Past due, non-accruing	109	86
Commercial | Commercial, financial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	31,119	30,885
Total Accruing	31,147	30,943
Current, non-accruing	80	97
Total Non- Accruing	129	125
Loans and leases	31,276	31,068
Commercial | Commercial, financial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	28	53
Past due, non-accruing	0	1
Commercial | Commercial, financial and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	5
Past due, non-accruing	49	27
Commercial | Commercial, financial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	27,678	26,367
Total Accruing	27,706	26,425
Current, non-accruing	80	97
Total Non- Accruing	129	125
Loans and leases	27,835	26,550
Nonaccrual, no allowance	123	99
Commercial | Commercial, financial and industrial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	28	53
Past due, non-accruing	0	1
Commercial | Commercial, financial and industrial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	5
Past due, non-accruing	49	27
Commercial | Commercial, financial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	3,441	4,518
Total Accruing	3,441	4,518
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	3,441	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	6	5
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,942	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	12,942	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	12,903
Total Accruing	12,931
Current, non-accruing	9
Total Non- Accruing	11
Loans and leases	12,942
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	28
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	2
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	11,441	10,772
Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	11,224	10,564
Total Accruing	11,282	10,634
Current, non-accruing	90	78
Total Non- Accruing	159	138
Loans and leases	11,441	10,772
Consumer | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	44	37
Past due, non-accruing	11	5
Consumer | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	14	33
Past due, non-accruing	58	55
Consumer | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	1,857	1,906
Total Accruing	1,872	1,919
Current, non-accruing	34	34
Total Non- Accruing	45	45
Loans and leases	1,917	1,964
Nonaccrual, no allowance	6	7
Consumer | Consumer Real Estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	9	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	6	6
Past due, non-accruing	9	9
Consumer | Consumer Real Estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	9,367	8,658
Total Accruing	9,410	8,715
Current, non-accruing	56	44
Total Non- Accruing	114	93
Loans and leases	9,524	8,808
Nonaccrual, no allowance	8	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	35	30
Past due, non-accruing	9	3
Consumer | Consumer Real Estate | Real estate installment loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	8	27
Past due, non-accruing	49	46
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	859	900
Total Accruing	868	907
Current, non-accruing	2	1
Total Non- Accruing	2	3
Loans and leases	870	910
Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	6	5
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	3	2
Past due, non-accruing	0	2
Consumer | Credit Card and Other | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	272	292
Total Accruing	278	296
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	278	296
Consumer | Credit Card and Other | Credit card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	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	3	2
Past due, non-accruing	0	0
Consumer | Credit Card and Other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	587	608
Total Accruing	590	611
Current, non-accruing	2	1
Total Non- Accruing	2	3
Loans and leases	592	614
Consumer | Credit Card and Other | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	3
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	$ 2