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Revenue Recognition - Summary of Disaggregation of Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Total Revenues $ 1,335 $ 1,256
Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Total Revenues (1) (1)
Operating Segments | U.S.    
Disaggregation of Revenue [Line Items]    
Total Revenues 572 534
Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 764 723
Recorded Music    
Disaggregation of Revenue [Line Items]    
Total Revenues 1,161 1,084
Recorded Music | Operating Segments | U.S.    
Disaggregation of Revenue [Line Items]    
Total Revenues 481 453
Recorded Music | Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 680 631
Recorded Music | Digital    
Disaggregation of Revenue [Line Items]    
Total Revenues 727 633
Recorded Music | Physical    
Disaggregation of Revenue [Line Items]    
Total Revenues 174 184
Recorded Music | Total Digital and Physical    
Disaggregation of Revenue [Line Items]    
Total Revenues 901 817
Recorded Music | Artist services and expanded-rights    
Disaggregation of Revenue [Line Items]    
Total Revenues 180 188
Recorded Music | Licensing    
Disaggregation of Revenue [Line Items]    
Total Revenues 80 79
Music Publishing    
Disaggregation of Revenue [Line Items]    
Total Revenues 175 173
Music Publishing | Operating Segments | U.S.    
Disaggregation of Revenue [Line Items]    
Total Revenues 91 81
Music Publishing | Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 84 92
Music Publishing | Digital    
Disaggregation of Revenue [Line Items]    
Total Revenues 99 73
Music Publishing | Performance    
Disaggregation of Revenue [Line Items]    
Total Revenues 30 46
Music Publishing | Mechanical    
Disaggregation of Revenue [Line Items]    
Total Revenues 11 15
Music Publishing | Synchronization    
Disaggregation of Revenue [Line Items]    
Total Revenues 33 36
Music Publishing | Other    
Disaggregation of Revenue [Line Items]    
Total Revenues $ 2 $ 3