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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,484	$ 1,494	$ 3,150	$ 3,242
Adjusted OIBDA	303	312	666	763
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenue	1,175	1,189	2,520	2,634
Adjusted OIBDA	270	272	593	684
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenue	310	306	633	610
Adjusted OIBDA	85	82	168	168
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenue	(1)	(1)	(3)	(2)
Adjusted OIBDA	$ (52)	$ (42)	$ (95)	$ (89)

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