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Acquisitions - Additional Information (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 17, 2017
USD ($)
Facility
Jan. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 2,315 $ 2,304 $ 2,253
Pharmachem [Member]          
Business Acquisition [Line Items]          
Business acquisition, revenue reported by acquired entity for last annual period $ 300        
Number of manufacturing facilities | Facility 14        
Business acquisition, purchase price in cash $ 680        
Working capital adjustments 20        
Business acquisition, transaction costs 5        
Finite-lived intangible assets, purchase accounting adjustments     18    
Goodwill, purchase accounting adjustments     $ 11 1  
Property, plant and equipment, purchase accounting adjustments       3  
Accounts payable, purchase accounting adjustments       1  
Deferred tax liabilities, purchase accounting adjustments       6  
Other non current asset, purchase accounting adjustments       $ 3  
Intangible assets 330        
Goodwill $ 288        
Vornia Limited [Member]          
Business Acquisition [Line Items]          
Business combination, consideration transferred   $ 12      
Business acquisition future payment   1      
Intellectual property   8      
Goodwill   $ 4