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ACQUISITIONS AND OTHER ARRANGEMENTS - Saudia Arabia Joint Venture Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2019
Acquisitions And Collaborations [Line Items]            
Cash     $ 0 $ 24 $ 0  
Estimated useful lives     10 years      
Percentage of common stock retained     100.00%      
Saudi Arabia Joint Venture            
Acquisitions And Collaborations [Line Items]            
Percentage of ownership acquired 51.00%          
Cash   $ 24        
Fair value of equity investment $ 39          
Percentage of common stock retained 49.00%          
Estimated noncontrolling interest in joint venture $ 39          
Saudi Arabia Joint Venture | Customer Relationship            
Acquisitions And Collaborations [Line Items]            
Acquired intangible assets, weighted-average useful life 10 years          
Saudi Arabia Joint Venture | Customer Relationship | Measurement Input Discount Rate            
Acquisitions And Collaborations [Line Items]            
Discount rate used to measure intangible assets 0.140          
Saudi Arabia Joint Venture | Reacquired License Rights            
Acquisitions And Collaborations [Line Items]            
Reacquired license rights fair value total $ 10          
Estimated useful lives 12 years          
Saudi Arabia Joint Venture | Reacquired License Rights | Measurement Input Discount Rate            
Acquisitions And Collaborations [Line Items]            
Discount rate used to measure intangible assets 0.130          
Saudi Arabia Joint Venture | Significant unobservable inputs (Level 3)            
Acquisitions And Collaborations [Line Items]            
Equity Method Investment, Underlying Equity in Net Assets           $ 39