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Revenue Recognition - Additional Information (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2021 USD ($) source	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Refund liabilities	$ 29		$ 24
Uncollectible accounts, reserves	19		$ 23
Deferred revenue increased related to cash received from customers	347
Revenue recognized related to deferred revenue	187
Revenue recognized from performance obligations satisfied in previous periods	$ 57	$ 35
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

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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-Section 50
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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