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Goodwill and Intangible Assets - Schedule of Changes in Goodwill for Each Reportable Segment (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 1,993
Acquisitions	3
Other adjustments	7
Ending balance	2,003
Recorded Music
Goodwill [Roll Forward]
Beginning balance	1,529
Acquisitions	3
Other adjustments	7
Ending balance	1,539
Music Publishing
Goodwill [Roll Forward]
Beginning balance	464
Acquisitions	0
Other adjustments	0
Ending balance	$ 464

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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