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Acquisitions - Schedule of Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Millions
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]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets 25    
Intangible assets 319    
Goodwill 643    
Fair value of net assets acquired 987    
Fair value of previously-held interest in the acquired entities $ 47