Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total Revenues	$ 6,037	$ 5,919	$ 5,301
United States
Disaggregation of Revenue [Line Items]
Total Revenues	2,766	2,744	2,363
Operating Segments | United States
Disaggregation of Revenue [Line Items]
Total Revenues	2,766	2,744	2,363
Operating Segments | International
Disaggregation of Revenue [Line Items]
Total Revenues	3,277	3,180	2,942
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Total Revenues	(6)	(5)	(4)
Recorded Music | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	4,955	4,966	4,544
Recorded Music | Operating Segments | United States
Disaggregation of Revenue [Line Items]
Total Revenues	2,184	2,231	1,985
Recorded Music | Operating Segments | International
Disaggregation of Revenue [Line Items]
Total Revenues	2,771	2,735	2,559
Recorded Music | Total Digital and Physical | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	3,829	3,868	3,654
Recorded Music | Digital | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	3,322	3,305	3,105
Recorded Music | Physical | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	507	563	549
Recorded Music | Artist services and expanded-rights | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	744	767	599
Recorded Music | Licensing | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	382	331	291
Music Publishing | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	1,088	958	761
Music Publishing | Operating Segments | United States
Disaggregation of Revenue [Line Items]
Total Revenues	582	513	378
Music Publishing | Operating Segments | International
Disaggregation of Revenue [Line Items]
Total Revenues	506	445	383
Music Publishing | Digital | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	669	563	436
Music Publishing | Performance | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	173	159	122
Music Publishing | Mechanical | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	63	50	49
Music Publishing | Synchronization | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	167	172	144
Music Publishing | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenues	$ 16	$ 14	$ 10