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BUSINESS COMBINATIONS - SUMMARY OF INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2020
May 01, 2018
Straight Smile LLC    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount $ 416  
OraMetrix, Inc.    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount   $ 97
Tradenames and trademarks | OraMetrix, Inc.    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets acquired, amount   14
Non-compete agreements | Straight Smile LLC    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount $ 16  
Weighted average useful life (in years) 5 years  
Technology know-how | Straight Smile LLC    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount $ 210  
Weighted average useful life (in years) 10 years  
Customer relationships | OraMetrix, Inc.    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount   $ 18
Weighted average useful life (in years)   15 years
Developed technology and patents | OraMetrix, Inc.    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount   $ 65
Weighted average useful life (in years)   15 years
Tradenames and trademarks | Straight Smile LLC    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired, amount $ 190  
Weighted average useful life (in years) 20 years