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Goodwill and Intangible Assets - Schedule of Changes in Goodwill for Each Reportable Segment (Details) $ in Millions	6 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 2,021
Acquisitions	21
Other adjustments	(11)
Ending balance	2,031
Recorded Music
Goodwill [Roll Forward]
Beginning balance	1,557
Acquisitions	21
Other adjustments	(11)
Ending balance	1,567
Music Publishing
Goodwill [Roll Forward]
Beginning balance	464
Acquisitions	0
Other adjustments	0
Ending balance	$ 464

X

- 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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) of asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized, classified as other.

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