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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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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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