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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Allowance for credit loss, reserve build $ 451 $ 923    
ACL Balance 1,747 2,670 $ 1,296  
Loans and leases   123,090 119,088  
Mortgage loans collateralized by residential real estate property   119 152  
Net change to ALLL from modification   12 9 $ 3
Charge-offs from modification of loans   $ 51 7 5
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    
Accrued interest receivable reversed against interest income   8    
ACL Balance 539 1,419 718  
Loans and leases   60,793 57,538  
TDR's that defaulted within 12 months of modification date   54 1 63
Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Accrued interest receivable reversed against interest income   19    
ACL Balance 1,208 1,251 578  
Loans and leases   62,297 61,550  
TDR's that defaulted within 12 months of modification date   46 37 $ 40
Commercial and industrial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
ACL Balance $ 376 895 575  
Loans and leases   $ 44,173 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   $ 552 227  
Collateral Dependent | Commercial and industrial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases   206 $ 85  
Payment Deferral | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loan restructuring, modification, amount   $ 343    
Loan restructuring, modification, percentage of total portfolio   0.60%    
Payment Deferral | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loan restructuring, modification, amount   $ 1,400    
Loan restructuring, modification, percentage of total portfolio   2.30%    
Payment Deferral | Business Banking Portfolio        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loan restructuring, modification, amount   $ 53    
Loan restructuring, modification, percentage of total portfolio   1.00%