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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