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Revenue Recognition - Narrative (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($) source | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Refund liabilities | $ 20 | $ 19 |
Uncollectible accounts, reserves | 26 | 19 |
Deferred revenue increased related to cash received from customers | 645 | 724 |
Revenue recognized related to deferred revenue | 330 | 393 |
Revenue recognized from performance obligations satisfied in previous periods | $ 122 | $ 91 | $ 59
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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