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Revenue Recognition - Additional Information (Detail) $ in Millions	6 Months Ended
	Mar. 31, 2021 USD ($) source	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Refund liabilities	$ 26		$ 24
Uncollectible accounts, reserves	24		$ 23
Deferred revenue increased related to cash received from customers	236
Revenue recognized related to deferred revenue	155
Revenue recognized from performance obligations satisfied in previous periods	$ 34	$ 30
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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-Section 45
-Paragraph 1
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- Definition

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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- Definition

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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