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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | $ 1 | $ 0
Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | (1) | 0
Other noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | 0 | 2
Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Other liabilities | $ (40) | $ (13)

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