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Revenue Recognition - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($) source	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Refund liabilities	$ 17	$ 20
Uncollectible accounts, reserves	27	26
Deferred revenue increased related to cash received from customers	1,100	645
Revenue recognized related to deferred revenue	207	330
Revenue recognized from performance obligations satisfied in previous periods	$ 82	$ 122	$ 91
Recorded Music
Disaggregation of Revenue [Line Items]
Number of revenue sources | source	4
Music Publishing
Disaggregation of Revenue [Line Items]
Number of revenue sources | source	5

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Amount of allowance for credit loss on accounts receivable.

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