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Restructuring and Impairments - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges, pretax |  | $ 240 |
Restructuring charges |  | $ 160 |
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Restructuring, Settlement and Impairment Provisions |
Non-cash impairments | $ 6 | $ 32 | $ 50
Cumulative restructuring and impairment charges | 218 | 218 |
Operating Segments | Recorded Music |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative restructuring and impairment charges | 208 | 208 |
Corporate expenses and eliminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative restructuring and impairment charges | 10 | 10 |
Severance And Other Termination Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges, pretax |  | 158 |
Restructuring charges |  | 136 |
Severance costs | $ 7 | 8 |
Severance And Other Termination Costs | Operating Segments | Recorded Music |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 9 |
Severance And Other Termination Costs | Corporate expenses and eliminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 1 |
Other Non-cash Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | 7 |
Non-cash Impairment Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges, pretax |  | 82 |
Restructuring charges |  | $ 82 |

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