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Revenue Recognition - Additional Information (Details) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) source	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Refund liabilities	$ 23	$ 24
Uncollectible accounts, reserves	20	23
Deferred revenue increased related to cash received from customers	585	527
Revenue recognized related to deferred revenue	232	157
Revenue recognized from performance obligations satisfied in previous periods	$ 64	$ 42	$ 51
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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- Definition

Amount of allowance for credit loss on accounts receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer.

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