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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,666	$ 1,748
Adjusted OIBDA	363	451
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenue	1,345	1,445
Adjusted OIBDA	323	412
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenue	323	304
Adjusted OIBDA	83	86
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenue	(2)	(1)
Adjusted OIBDA	$ (43)	$ (47)

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