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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 1,488	$ 1,614
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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