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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Allowance for credit loss, reserve build $ 463      
ACL Balance 2,210   $ 1,747 $ 1,296
Loans and leases 127,528     119,088
Mortgage loans collateralized by OREO 144     152
Net change to ALLL from modification 4 $ 2    
Charge-offs from modification of loans $ 2 1    
High loan to value criteria (exceeds) 90.00%      
Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
ACL Balance $ 790   539 718
Accrued interest receivable reversed against interest income 1      
Loans and leases 66,032     57,538
TDR's that defaulted within 12 months of modification date 13 0    
Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
ACL Balance 1,420   1,208 578
Accrued interest receivable reversed against interest income 5      
Loans and leases 61,496     61,550
TDR's that defaulted within 12 months of modification date 11 $ 9    
Commercial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
ACL Balance 613   $ 376 575
Loans and leases $ 49,092     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 $ 271     227
Collateral Dependent | Commercial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases $ 155     $ 85