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Related Party Transactions - Narrative (Details) € in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 13, 2022 EUR (€) shares | Jan. 01, 2015 GBP (£) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Oct. 01, 2018 USD ($) shares
Related Party Transaction [Line Items] |  |  |  |  |  |
Remaining lease term |  |  | 7 years | 7 years |  |
Extended lease term |  |  | 10 years |  |  |
Revenue |  |  | $ 6,037 | $ 5,919 | $ 5,301 |
I2PO |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Business acquisition, number of shares acquired (in shares) | shares | 900,000 |  |  |  |  |
Final purchase price | € | € 9 |  |  |  |  |
Fair value of equity interests |  |  | 14 |  |  |
WMG China | Tencent Music Entertainment Group |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  |  | 20.00%
WMG China | AI New Holdings 5 LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent (as a percent) |  |  |  |  |  | 80.00%
WMG China | Tencent Music Entertainment Group |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchase of ordinary shares (in shares) | shares |  |  |  |  |  | 37,162,288
Purchase of ordinary shares, value |  |  |  |  |  | $ 100
Warner and Chappell Music Limited and WMG Acquisition Limited |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Extended lease term |  | 5 years |  |  |  |
Payments for rent | £ |  | £ 3,460,250 |  |  |  |
Deezer | Streaming Service License |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue |  |  | 40 | 36 | 42 |
Deezer | PEDL And Latin America Licenses |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue |  |  | 2 | $ 2 | $ 2 |
Building |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transactions, annual rent payments |  |  | $ 14 |  |  |
Remaining lease term |  |  | 7 years |  |  |
Extended lease term |  |  | 10 years |  |  |

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