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Derivative Instruments and Hedging Activities - Additional Information (Detail) - Interest Rate Swap - Cash flow hedges $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)
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	$ 67
Derivative Notional Amount Terminated	$ 500	$ 500

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