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Acquisitions - Schedule of Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]      
Goodwill $ 15,910 $ 15,656 $ 15,194
2019 Business Acquisitions      
Business Acquisition [Line Items]      
Net tangible assets acquired (liabilities assumed) 23    
Intangible assets 319    
Goodwill 647    
Fair value of net assets acquired 989    
Fair value of previously-held interest in the acquired entities $ 47