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Revenue Recognition - Summary of Disaggregation of Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]          
Total Revenues $ 1,748 $ 1,488 $ 6,037 $ 5,919 $ 5,301
Operating Segments | U.S.          
Disaggregation of Revenue [Line Items]          
Total Revenues 799 672      
Operating Segments | International          
Disaggregation of Revenue [Line Items]          
Total Revenues 950 817      
Intersegment eliminations          
Disaggregation of Revenue [Line Items]          
Total Revenues (1) (1)      
Recorded Music | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 1,445 1,239 4,955 4,966 4,544
Recorded Music | Operating Segments | U.S.          
Disaggregation of Revenue [Line Items]          
Total Revenues 627 539      
Recorded Music | Operating Segments | International          
Disaggregation of Revenue [Line Items]          
Total Revenues 818 700      
Recorded Music | Digital | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 908 803      
Recorded Music | Physical | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 154 133      
Recorded Music | Total Digital and Physical | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 1,062 936      
Recorded Music | Artist services and expanded-rights | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 204 206      
Recorded Music | Licensing | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 179 97      
Music Publishing | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 304 250 $ 1,088 $ 958 $ 761
Music Publishing | Operating Segments | U.S.          
Disaggregation of Revenue [Line Items]          
Total Revenues 172 133      
Music Publishing | Operating Segments | International          
Disaggregation of Revenue [Line Items]          
Total Revenues 132 117      
Music Publishing | Digital | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 196 149      
Music Publishing | Performance | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 51 45      
Music Publishing | Mechanical | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 15 14      
Music Publishing | Synchronization | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues 39 39      
Music Publishing | Other | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total Revenues $ 3 $ 3