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Financial Statements - Additional Information (Detail) $ in Millions	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)
Financial Statement Details [Line Items]
Number of Countries in which Entity Operates	150
Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method	20.00%
Restricted Cash and Cash Equivalents	$ 11	$ 9

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Financial Statement Details [Line Items]

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Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method.

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The number of countries in which the entity operates as of balance sheet date.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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-Topic 944
-SubTopic 210
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