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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Goodwill $ 15,656 $ 15,194 $ 15,110
2019 Business Acquisitions      
Business Acquisition [Line Items]      
Total purchase consideration 940    
Cash portion of purchase consideration 886    
Deferred cash portion of purchase consideration 54    
Goodwill 643    
Expected deductible portion of goodwill $ 360