v3.26.1
Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Redeemable Noncontrolling Interest [Line Items]          
Capital contributions $ 1   $ 135    
Net loss 4   5    
Net loss attributions 3   3    
Remeasurement of redeemable noncontrolling interest     1 $ 0  
Remeasurement of redeemable noncontrolling interest 2   2    
Redeemable noncontrolling interest 133   133   $ 0
Consideration for sale of music catalog rights   $ 233      
Proceeds from sale of music catalog rights   $ 182      
Additional Paid-in Capital          
Redeemable Noncontrolling Interest [Line Items]          
Remeasurement of redeemable noncontrolling interest $ 2   $ 2    
Beethoven JV Credit Agreement          
Redeemable Noncontrolling Interest [Line Items]          
Quarterly cash distributions from joint ventures, percentage 50.00%   50.00%    
Annualized return on contributed capital, percentage 8.00%   8.00%    
Beethoven JV Credit Agreement | Beethoven JV 1, LLC          
Redeemable Noncontrolling Interest [Line Items]          
Noncontrolling percentage 50.00%   50.00%