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Restructuring and Impairments - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]      
Non-cash impairments   $ 102 $ 50
Cumulative restructuring and impairment charges $ 217 217  
Recorded Music      
Restructuring Cost and Reserve [Line Items]      
Non-cash impairments   32  
Other impairments 70 70  
Other impairments, after-tax 48 48  
Operating Segments | Recorded Music      
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring and impairment charges 207 207  
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]      
Severance costs   7  
Restructuring charges   135  
Severance And Other Termination Costs | Operating Segments | Recorded Music      
Restructuring Cost and Reserve [Line Items]      
Severance costs $ (1) 8  
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  
Property Wind Down      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 82