Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 1,256	$ 1,203
Operating income (loss)	165	147
Amortization of intangible assets	47	54
Depreciation of property, plant and equipment	24	14
OIBDA	236	215
Operating Segments | Recorded Music
Segment Reporting Information [Line Items]
Revenues	1,084	1,041
Operating income (loss)	191	163
Amortization of intangible assets	29	38
Depreciation of property, plant and equipment	21	10
OIBDA	241	211
Operating Segments | Music Publishing
Segment Reporting Information [Line Items]
Revenues	173	165
Operating income (loss)	14	22
Amortization of intangible assets	18	16
Depreciation of property, plant and equipment	1	1
OIBDA	33	39
Corporate expenses and eliminations
Segment Reporting Information [Line Items]
Revenues	(1)	(3)
Operating income (loss)	(40)	(38)
Amortization of intangible assets	0	0
Depreciation of property, plant and equipment	2	3
OIBDA	$ (38)	$ (35)