Revenue Recognition - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total Revenues	$ 1,614	$ 1,335
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Total Revenues	(1)	(1)
Operating Segments | U.S.
Disaggregation of Revenue [Line Items]
Total Revenues	723	572
Operating Segments | International
Disaggregation of Revenue [Line Items]
Total Revenues	892	764
Recorded Music | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	1,386	1,161
Recorded Music | Operating Segments | U.S.
Disaggregation of Revenue [Line Items]
Total Revenues	608	481
Recorded Music | Operating Segments | International
Disaggregation of Revenue [Line Items]
Total Revenues	778	680
Recorded Music | Digital | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	870	727
Recorded Music | Physical | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	195	174
Recorded Music | Total Digital and Physical | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	1,065	901
Recorded Music | Artist services and expanded-rights | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	232	180
Recorded Music | Licensing | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	89	80
Music Publishing | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	229	175
Music Publishing | Operating Segments | U.S.
Disaggregation of Revenue [Line Items]
Total Revenues	115	91
Music Publishing | Operating Segments | International
Disaggregation of Revenue [Line Items]
Total Revenues	114	84
Music Publishing | Digital | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	133	99
Music Publishing | Performance | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	38	30
Music Publishing | Mechanical | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	14	11
Music Publishing | Synchronization | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	42	33
Music Publishing | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	$ 2	$ 2