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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,554	$ 1,564	$ 4,796	$ 4,451
Adjusted OIBDA	316	297	1,079	918
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenue	1,251	1,282	3,885	3,664
Adjusted OIBDA	281	264	965	812
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenue	305	283	915	790
Adjusted OIBDA	79	74	247	222
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenue	(2)	(1)	(4)	(3)
Adjusted OIBDA	$ (44)	$ (41)	$ (133)	$ (116)

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