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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts in asset | $ 9 |
Foreign exchange derivative contracts in liability | 15 |
Other Current Assets | Interest Rate Swap |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | 0 | $ 2
Other Current Liabilities | Interest Rate Swap |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency forward exchange contract | (6) | $ 0
Other Current Liabilities | Foreign Exchange Contract |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency forward exchange contract | $ (6) |

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