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STOCKHOLDERS' EQUITY - Preferred Stock Narrative (Details) - USD ($)
 1 Months Ended
Jun. 11, 2021
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Class of Stock [Line Items]        
Preferred stock, value, issued     $ 2,014,000,000 $ 1,965,000,000
Preferred stock, issued (in shares)     2,050,000 2,000,000
Preferred stock, par value (in dollars per share)     $ 25.00 $ 25.00
Series A Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, dividend rate   5.50%    
Preferred stock, value, issued     $ 0 $ 247,000,000
Preferred stock, issued (in shares)     0 250,000
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000  
Series G Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, dividend rate 4.00%      
Preferred stock, value, issued $ 300,000,000   $ 296,000,000 $ 0
Preferred stock, issued (in shares)     300,000 0
Preferred stock, par value (in dollars per share) $ 25      
Preferred stock, liquidation preference per share (in dollars per share)     $ 1,000