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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income            
Accumulated other comprehensive loss $ (135) $ (611) $ 605 $ 655 $ 546 $ 1,136
Foreign currency translation adjustment            
Accumulated Other Comprehensive Income            
Accumulated other comprehensive loss (1,875)   (2,077)      
Pension and postretirement benefit plan adjustments, net of income taxes            
Accumulated Other Comprehensive Income            
Accumulated other comprehensive loss (48)   (56)      
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income            
Accumulated other comprehensive loss $ (1,923) $ (2,182) $ (2,133) $ (2,207) $ (2,223) $ (2,086)