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SHAREHOLDERS' EQUITY - Stock Repurchase (Details) - USD ($)
shares in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 10, 2021
Sep. 30, 2019
Class of Stock [Line Items]          
Stock repurchase program, authorized amount         $ 2,000,000,000.0
Repurchase and retirement of common stock (in shares) 18.8 20.1 18.6    
Repurchase and retirement of common stock to offset the dilutive impact of the grant of long-term stock awards (in shares) 0.4 0.6 0.7    
Repurchase and retirement of common stock $ 727,000,000 $ 896,000,000 $ 654,000,000    
Remaining authorized repurchase amount $ 774,000,000        
Subsequent Event          
Class of Stock [Line Items]          
Stock repurchase program, authorized amount       $ 2,000,000,000.0