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Revenue Recognition - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2020 USD ($) source	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Refund liabilities	$ 37		$ 24
Uncollectible accounts, reserves	24		$ 23
Deferred revenue increased related to cash received from customers	128
Revenue recognized related to deferred revenue	87
Revenue recognized from performance obligations satisfied in previous periods	$ 20	$ 27
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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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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.

+ References

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-Name Accounting Standards Codification
-Topic 606
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-Paragraph 12A
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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
-Publisher FASB
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