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Property, Equipment and Technology, Net - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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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

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