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Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 6,707 | $ 6,426 | $ 6,037
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 2,874 | 2,870 | 2,766
Operating Segments | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 2,874 | 2,870 | 2,766
Operating Segments | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 3,840 | 3,563 | 3,277
Operating Segments | Recorded Music |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 5,408 | 5,223 | 4,955
Operating Segments | Recorded Music | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 2,181 | 2,210 | 2,184
Operating Segments | Recorded Music | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 3,227 | 3,013 | 2,771
Operating Segments | Music Publishing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 1,306 | 1,210 | 1,088
Operating Segments | Music Publishing | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 693 | 660 | 582
Operating Segments | Music Publishing | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 613 | 550 | 506
Operating Segments | Total digital and physical | Recorded Music |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 4,121 | 4,038 | 3,829
Operating Segments | Digital | Recorded Music |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 3,594 | 3,519 | 3,322
Operating Segments | Digital | Music Publishing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 800 | 763 | 669
Operating Segments | Physical | Recorded Music |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 527 | 519 | 507
Operating Segments | Artist services and expanded-rights | Recorded Music |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 835 | 684 | 744
Operating Segments | Licensing | Recorded Music |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 452 | 501 | 382
Operating Segments | Performance | Music Publishing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 228 | 198 | 173
Operating Segments | Mechanical | Music Publishing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 63 | 58 | 63
Operating Segments | Synchronization | Music Publishing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 197 | 175 | 167
Operating Segments | Other | Music Publishing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 18 | 16 | 16
Intersegment eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ (7) | $ (7) | $ (6)

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