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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 1,748	$ 1,488	$ 6,037	$ 5,919	$ 5,301
Adjusted OIBDA	451	335	1,235	1,149	1,018
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenue	1,445	1,239	4,955	4,966	4,544
Adjusted OIBDA	412	299	1,093	1,046	975
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenue	304	250	1,088	958	761
Adjusted OIBDA	86	72	296	233	179
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenue	(1)	(1)	(6)	(5)	(4)
Adjusted OIBDA	$ (47)	$ (36)	$ (154)	$ (130)	$ (136)

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: 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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