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Acquisitions - Schedule of Identified Intangible Assets Acquired (Details) - 2019 Business Acquisitions
$ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
Acquisition Date Fair Value $ 319
Weighted-Average Useful Life 10 years
Developed technologies  
Acquired Finite-Lived Intangible Assets [Line Items]  
Acquisition Date Fair Value $ 70
Weighted-Average Useful Life 4 years
Customer relationships  
Acquired Finite-Lived Intangible Assets [Line Items]  
Acquisition Date Fair Value $ 249
Weighted-Average Useful Life 12 years