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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 1,399	$ 1,376	$ 2,887	$ 2,990
Revision of Prior Period, Change in Accounting Principle, Adjustment | Recorded Music
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue				$ 73

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