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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Allowance for credit loss, reserve build     $ 780      
ACL Balance $ 2,527   2,527   $ 1,747 $ 1,296
Loans and leases 125,713   125,713     119,088
Mortgage loans collateralized by OREO 135   135     152
Net change to ALLL from modification 5 $ 2 9 $ 4    
Charge-offs from modification of loans 4 1 $ 6 2    
High loan to value criteria (exceeds)     90.00%      
Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
ACL Balance 1,304   $ 1,304   539 718
Allowance for credit losses, individually evaluated for impairment 5   5      
Accrued interest receivable reversed against interest income 2   3      
Loans and leases 64,930   64,930     57,538
TDR's that defaulted within 12 months of modification date 26 1 39 1    
Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
ACL Balance 1,223   1,223   1,208 578
Accrued interest receivable reversed against interest income 4   9      
Loans and leases 60,783   60,783     61,550
TDR's that defaulted within 12 months of modification date 14 $ 10 25 $ 19    
Commercial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
ACL Balance 847   847   $ 376 575
Loans and leases 48,017   $ 48,017     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 405   $ 405     227
Collateral Dependent | Commercial | Commercial            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loans and leases 213   213     $ 85
Payment Deferral | Retail            
Financing Receivable, Troubled Debt Restructuring [Line Items]            
Loan restructuring, modification, amount $ 3,500   $ 3,500      
Loan restructuring, modification, percentage of total portfolio 6.00%   6.00%