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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts in asset | $ 12 |
Foreign exchange derivative contracts in liability | 10 |
Interest Rate Swap |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts in asset | 8 |
Foreign exchange derivative contracts in liability | 2 | $ 22
Foreign Exchange Contract |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts in asset | 3 |
Foreign exchange derivative contracts in liability | 1 |
Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | 3 | 0
Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | (3) | 0
Other current liabilities | Foreign Exchange Contract |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | (1) |
Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | 8 | 0
Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | $ 0 | $ (22)

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