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Restructuring and Impairments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charge, pretax | $ 210 |  |
Restructuring and impairments | $ 135 |  |
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] | Restructuring, Settlement and Impairment Provisions |  |
Restructuring and impairments | $ 177 | $ 42 | $ 8
Non-cash impairments and restructuring | 57 | 0 | $ 0
Impairment losses on unamortized intangible assets | $ 50 |  |
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] | Restructuring, Settlement and Impairment Provisions |  |
Non-cash restructuring | $ 7 |  |
Strategic Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and impairments | 121 |  |
Restructuring and impairments | 178 |  |
March 2023 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and impairments | 1 |  |
Recorded Music | March 2023 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | $ 40 |
Operating Segments | Recorded Music |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and impairments | 54 |  |
Corporate Expenses and Eliminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and impairments | $ 3 |  |
Severance Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected number of positions to eliminated as a percentage (as a percent) | 13.00% |  |
Restructuring and impairments | $ (1) |  |
Severance Costs | Strategic Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and impairments | 116 |  |
Severance And Other Termination Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charge, pretax | 148 |  |
Severance costs | 121 |  |
Severance And Other Termination Costs | Operating Segments | Recorded Music |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 113 |  |
Severance And Other Termination Costs | Corporate Expenses and Eliminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 8 |  |
Other Non-cash Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charge, pretax | 7 |  |
Property Wind Down |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charge, pretax | $ 55 |  |

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