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SUBSEQUENT EVENTS - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jul. 07, 2020
Subsequent Event [Line Items]            
Cash dividends declared per common share (in usd per share)   $ 0.17 $ 0.15 $ 0.32 $ 0.28  
Conversion to preferred stock from depositary stock (in shares)   0.001 0.001 0.001 0.001  
Dividends declared per depositary share (in usd per share)   $ 0.33 $ 0 $ 0.72 $ 0  
Subsequent Event            
Subsequent Event [Line Items]            
Cash dividends declared per common share (in usd per share) $ 0.17          
Subsequent Event | Depositary Shares, each representing a 1/1,000th interest in a share of Fixed Rate Noncumulative Perpetual Preferred Stock, Series A            
Subsequent Event [Line Items]            
Dividends declared in preferred stock (in usd per share) $ 328.125          
Preferred stock, dividend rate, percentage 5.25%          
Liquidation preference in preferred stock (in usd per share) $ 25,000          
Conversion to preferred stock from depositary stock (in shares) 0.001          
Dividends declared per depositary share (in usd per share) $ 0.328125          
Trust Notes            
Subsequent Event [Line Items]            
Line of credit facility, maximum borrowing capacity   $ 5,000,000,000   $ 5,000,000,000    
Trust Notes | Subsequent Event            
Subsequent Event [Line Items]            
Debt instrument, face amount           $ 650,000,000
Debt instrument, stated percentage           1.40%