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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax	$ 27
Foreign currency-denominated debt | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax		$ 0
Interest Rate Swap | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax		(10)	$ 23
Net after-tax gain upon termination of contract		$ 67

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