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RESTRUCTURING AND OTHER COSTS - ADDITIONAL INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 06, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2020
Nov. 30, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring costs and asset impairment charges   $ 123 $ 128 $ 262    
Restructuring and related cost, accelerated depreciation   14 3 11    
Severance costs   23 37 25    
Impairment of intangible assets   39 9      
Other asset impairment charges   8        
Fixed asset impairment   3 33 0    
Asset impairment charges       179    
Restructuring incurred cost   59        
Inventory write-down            
Restructuring Cost and Reserve [Line Items]            
Restructuring costs and asset impairment charges   31 $ 20 $ 13    
Restructuring incurred cost   31        
Restructuring and other costs            
Restructuring Cost and Reserve [Line Items]            
Expected cost         $ 375 $ 275
Accelerated depreciation            
Restructuring Cost and Reserve [Line Items]            
Restructuring incurred cost   14        
Severance            
Restructuring Cost and Reserve [Line Items]            
Restructuring incurred cost   $ 9        
Traditional Orthodontics Business And Portions Of Laboratory Business | Technologies And Equipment And Consumables Segments | Minimum            
Restructuring Cost and Reserve [Line Items]            
Expected cost $ 70          
Restructuring and related cost, number of positions eliminated, period percent 4.00%          
Traditional Orthodontics Business And Portions Of Laboratory Business | Technologies And Equipment And Consumables Segments | Maximum            
Restructuring Cost and Reserve [Line Items]            
Expected cost $ 80          
Restructuring and related cost, number of positions eliminated, period percent 5.00%