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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