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Property, Equipment and Technology, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]      
Technology, accumulated amortization $ 3,500 $ 3,400  
Depreciation and amortization 1,034 943 $ 861
Property, Equipment and Technology      
Finite-Lived Intangible Assets [Line Items]      
Depreciation and amortization $ 955 $ 867 $ 771