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Property, Equipment and Technology, Net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Technology, accumulated amortization	$ 4,000	$ 3,500
Depreciation and amortization	1,220	1,034	$ 943
Property, Equipment and Technology
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization	$ 1,100	$ 955	$ 867

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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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