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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Charge-offs $ 158    
Provision for credit losses (140) $ 600  
ACL Balance 2,400   $ 2,700
Loans and leases 122,195   123,090
Mortgage loans collateralized by OREO 112   119
Net change to ALLL from modification 0 4  
Charge-offs from modification of loans $ 2 2  
High loan to value criteria (exceeds) 90.00%    
Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Charge-offs $ 60    
Accrued interest receivable reversed against interest income 1 1  
Loans and leases 60,413   60,793
TDR's that defaulted within 12 months of modification date 22 13  
Retail      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Charge-offs increase (decrease) (39)    
Accrued interest receivable reversed against interest income 6 5  
Loans and leases 61,782   62,297
TDR's that defaulted within 12 months of modification date 15 $ 11  
Commercial and industrial | Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans and leases 44,058   44,173
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans and leases 613   552
Collateral Dependent | Commercial and industrial | Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans and leases $ 110   $ 206