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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
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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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