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Goodwill and Intangible Assets - Schedule of Changes in Goodwill for Each Reportable Segment (Details) $ in Millions	9 Months Ended
	Jun. 30, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 2,021
Acquisitions	22
Other adjustments	21
Ending balance	2,064
Recorded Music
Goodwill [Roll Forward]
Beginning balance	1,557
Acquisitions	22
Other adjustments	21
Ending balance	1,600
Music Publishing
Goodwill [Roll Forward]
Beginning balance	464
Acquisitions	0
Other adjustments	0
Ending balance	$ 464

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