Investments - Schedule of Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021
Schedule of Investments [Abstract]
Equity method investments	$ 276		$ 71
Equity securities	212		280
Total Investments	$ 488		$ 351
PropertyGuru Pte. Ltd. \| REA Group
Schedule of Equity Method Investments [Line Items]
Ownership percentage	18.00%	18.00%
Equity method investment, diluted ownership percentage	17.50%	16.60%

Equity Method Investment, Diluted Ownership Percentage

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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