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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Allowance for credit loss, reserve build $ 451     $ 989    
ACL Balance 1,747 $ 2,736   2,736   $ 1,296
Loans and leases   124,071   124,071   119,088
Mortgage loans collateralized by OREO   129   129   152
Net change to ALLL from modification   (30) $ 3 (21) $ 7  
Charge-offs from modification of loans   43 1 $ 49 3  
High loan to value criteria (exceeds)       90.00%    
Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Allowance for credit losses, individually evaluated for impairment   5   $ 5    
Accrued interest receivable reversed against interest income   4   7    
ACL Balance 539 1,441   1,441   718
Loans and leases   62,362   62,362   57,538
TDR's that defaulted within 12 months of modification date   14 0 53 1  
Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Accrued interest receivable reversed against interest income   4   13    
ACL Balance 1,208 1,295   1,295   578
Loans and leases   61,709   61,709   61,550
TDR's that defaulted within 12 months of modification date   22 $ 9 47 $ 28  
Commercial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
ACL Balance $ 376 826   826   575
Loans and leases   45,185   $ 45,185   41,479
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Collateral value, valuation frequency period       90 days    
Loans and leases   489   $ 489   227
Collateral Dependent | Commercial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases   144   144   $ 85
Payment Deferral | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loan restructuring, modification, amount   $ 795   $ 795    
Loan restructuring, modification, percentage of total portfolio   1.40%   1.40%    
Payment Deferral | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loan restructuring, modification, amount   $ 2,400   $ 2,400    
Loan restructuring, modification, percentage of total portfolio   3.80%   3.80%    
Payment Deferral | Business Banking Portfolio            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loan restructuring, modification, amount   $ 464   $ 464    
Loan restructuring, modification, percentage of total portfolio   8.10%   8.10%