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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs $ 74 $ 44 $ 182 $ 280  
Credit provision 123 (33) 342 (386)  
Initial provision expense related to non-PCD loans and leases acquired     102    
Increase to ACL     262    
Loans and leases 156,140   156,140   $ 128,163
Mortgage loans collateralized by OREO 219   219   142
TDR commitment to lend 117   117   56
Charge-offs 116 87 308 439  
Troubled Debt Restructuring          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Charge-offs   1 2 5  
Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs 15 14 36 159  
Loans and leases 81,114   81,114   60,350
Charge-offs 22 17 49 196  
Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Net charge-offs 59 30 146 121  
Loans and leases 75,026   75,026   67,813
Charge-offs 94 $ 70 259 $ 243  
Commercial and industrial | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases 50,989   50,989   44,500
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases 537   537   542
Collateral Dependent | Commercial and industrial | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases $ 18   $ 18   $ 103