v3.21.2
Property, Equipment and Technology, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]      
Technology, accumulated amortization $ 3,200 $ 2,700  
Depreciation and amortization 804 767 $ 656
Property, Equipment and Technology      
Finite-Lived Intangible Assets [Line Items]      
Depreciation and amortization $ 721 $ 687 $ 596