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BUSINESS OPTIMIZATION CHARGES - Summary of Activity in Reserves Related to Restructuring Initiatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Reserve [Roll Forward]        
Charges $ 10 $ 7 $ 35 $ 32
Severance and Other Employee Related Costs        
Restructuring Reserve [Roll Forward]        
Reserve, beginning balance     113  
Charges     33  
Payments     (46)  
Reserve adjustments     (3)  
Currency translation     (3)  
Reserve, ending balance $ 94   $ 94