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BUSINESS OPTIMIZATION CHARGES - Summary of Activity in Reserves Related to Restructuring Initiatives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Reserve [Roll Forward]        
Charges $ 32 $ 26 $ 67 $ 58
Severance and Other Employee Related Costs        
Restructuring Reserve [Roll Forward]        
Reserve, beginning balance     113  
Charges     54  
Payments     (62)  
Reserve adjustments     (3)  
Currency translation     (6)  
Reserve, ending balance $ 96   $ 96