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Property, Equipment and Technology, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]      
Technology, accumulated amortization $ 3,400 $ 3,700  
Depreciation and amortization 943 861 $ 804
Property, Equipment and Technology      
Finite-Lived Intangible Assets [Line Items]      
Depreciation and amortization $ 867 $ 771 $ 721