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Acquisitions (Detail) - USD ($)
$ in Millions
Jul. 18, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]        
Goodwill   $ 24,621 $ 23,886 $ 23,604
Parata Systems        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred $ 1,548      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Net Assets 12      
Goodwill 746      
Parata Systems | Developed technology        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 628      
Parata Systems | Customer relationships        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 161