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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]      
Cost of stock repurchase $ 270 $ 1,220 $ 1,025
Treasury stock purchased (in shares) 7,548,655 34,305,768  
Treasury stock purchased, price per share (in dollars per share) $ 35.77 $ 35.56  
Deferred compensation, share-based payments      
Class of Stock [Line Items]      
Shares repurchased (in shares) 0 0