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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,494	$ 1,399	$ 3,242	$ 2,887
Adjusted OIBDA	312	286	763	621
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenue	1,189	1,143	2,634	2,382
Adjusted OIBDA	272	249	684	548
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenue	306	257	610	507
Adjusted OIBDA	82	76	168	148
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenue	(1)	(1)	(2)	(2)
Adjusted OIBDA	$ (42)	$ (39)	$ (89)	$ (75)

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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