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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,689	$ 1,554	$ 4,839	$ 4,796
Adjusted OIBDA	373	316	1,039	1,079
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenue	1,354	1,251	3,874	3,885
Adjusted OIBDA	321	281	914	965
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenue	336	305	969	915
Adjusted OIBDA	96	79	264	247
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenue	(1)	(2)	(4)	(4)
Adjusted OIBDA	$ (44)	$ (44)	$ (139)	$ (133)

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