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Goodwill and Intangible Assets - Schedule of Changes in Goodwill for Each Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Roll Forward]
Beginning balance	$ 2,021	$ 1,993
Acquisitions	24	5
Impairments	(4)
Other adjustments	20	23
Ending balance	2,061	2,021
Recorded Music
Goodwill [Roll Forward]
Beginning balance	1,557	1,529
Acquisitions	24	5
Impairments	(4)
Other adjustments	20	23
Ending balance	1,597	1,557
Music Publishing
Goodwill [Roll Forward]
Beginning balance	464	464
Acquisitions	0	0
Impairments	0
Other adjustments	0	0
Ending balance	$ 464	$ 464

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