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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income        
Accumulated other comprehensive loss $ (124) $ 605 $ 790 $ 1,136
Foreign currency translation adjustment        
Accumulated Other Comprehensive Income        
Accumulated other comprehensive loss (2,201) (2,077)    
Pension and postretirement benefit plan adjustments, net of income taxes        
Accumulated Other Comprehensive Income        
Accumulated other comprehensive loss (55) (56)    
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income        
Accumulated other comprehensive loss $ (2,256) $ (2,133) $ (2,281) $ (2,086)