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Additional Financial Information - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Feb. 08, 2022 $ / shares
Dividends Payable [Line Items]
Interest payments	$ 44	$ 37	$ 57	$ 64
Income and withholding taxes paid	37	$ 35	66	52
Dividends paid	$ 78		$ 156	$ 125
Dividends paid (in dollars per share) | $ / shares	$ 0.15		$ 0.30
Noncash investing activities related to acquisition of music publishing rights and music catalogs	$ 125
Revolving Credit Facility | Line of Credit
Dividends Payable [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio	3.50		3.50
Common Stock
Dividends Payable [Line Items]
Cash dividends declared (in dollars per share) | $ / shares					$ 0.15

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