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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |
Revenue | $ 1,666 | $ 1,748
Adjusted OIBDA | 363 | 451
Operating Segments | Recorded Music |  |
Segment Reporting Information [Line Items] |  |
Revenue | 1,345 | 1,445
Adjusted OIBDA | 323 | 412
Operating Segments | Music Publishing |  |
Segment Reporting Information [Line Items] |  |
Revenue | 323 | 304
Adjusted OIBDA | 83 | 86
Corporate expenses and eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenue | (2) | (1)
Adjusted OIBDA | $ (43) | $ (47)

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