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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Other current assets
Derivatives, Fair Value [Line Items]
Other assets	$ 0	$ 0
Other current liabilities
Derivatives, Fair Value [Line Items]
Other liabilities	(4)	0
Other noncurrent assets
Derivatives, Fair Value [Line Items]
Other assets	0	0
Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Other liabilities	$ (34)	$ (38)

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- Definition

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- Definition

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