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Derivative Instruments and Hedging Activities - Additional Information (Detail) - Cash flow hedges - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2024
Foreign Exchange Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax	$ 0	$ 0
Foreign currency cash flow hedge gain (loss) reclassified to earnings, net	$ 0	0
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss), cash flow hedge, gain (loss) upon termination of derivative instrument, after reclassification and tax, parent		$ 67

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Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss) Upon Termination Of Derivative Instrument, After Reclassification And Tax, Parent

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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