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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 |  |

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