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Summary of Significant Accounting Policies - Narrative (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue $ 1,564 $ 1,432 $ 4,451 $ 4,422
Revision of Prior Period, Change in Accounting Principle, Adjustment | Recorded Music        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue       $ 73