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Revenue Recognition - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 1,250 | $ 1,071 | $ 2,585 | $ 2,327
Intersegment eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | (1) | (2) | (2) | (3)
Operating Segments | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 565 | 467 | 1,137 | 1,001
Operating Segments | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 686 | 606 | 1,450 | 1,329
Recorded Music |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 1,059 | 907 | 2,220 | 1,991
Recorded Music | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 1,059 | 907 | 2,220 | 1,991
Recorded Music | Operating Segments | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 469 | 380 | 950 | 833
Recorded Music | Operating Segments | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 590 | 527 | 1,270 | 1,158
Recorded Music | Digital |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 756 | 626 | 1,483 | 1,259
Recorded Music | Physical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 118 | 94 | 292 | 278
Recorded Music | Total Digital and Physical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 874 | 720 | 1,775 | 1,537
Recorded Music | Artist services and expanded-rights |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 118 | 115 | 298 | 303
Recorded Music | Licensing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 67 | 72 | 147 | 151
Music Publishing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 192 | 166 | 367 | 339
Music Publishing | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 192 | 166 | 367 | 339
Music Publishing | Operating Segments | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 96 | 87 | 187 | 168
Music Publishing | Operating Segments | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 96 | 79 | 180 | 171
Music Publishing | Digital |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 104 | 74 | 203 | 147
Music Publishing | Performance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 35 | 41 | 65 | 87
Music Publishing | Mechanical |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 12 | 15 | 23 | 30
Music Publishing | Synchronization |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 38 | 34 | 71 | 70
Music Publishing | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 3 | $ 2 | $ 5 | $ 5

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