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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Derivatives, Fair Value [Line Items] |  |  |  |  |
Deferred (losses) gains on derivative financial instruments | $ 0 | $ (4) | $ (1) | $ (5) |
Interest Rate Swap |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Outstanding hedge contracts |  |  |  |  | $ 500
Deferred (losses) gains on derivative financial instruments |  |  |  |  | $ 1
Unrealized pre-tax (losses) gains on derivative financial instruments |  |  | (1) | 7 |
Foreign Exchange Contract | Other Income (Expense) |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Unrealized foreign exchange forward contract gain (loss) |  |  | 0 | 4 |
Realized foreign exchange forward contract loss |  |  | (1) | $ 2 |
Sale |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Outstanding hedge contracts | 326 |  | 326 |  |
Purchase |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Outstanding hedge contracts | $ 192 |  | $ 192 |  |

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