Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 30	$ (88)	$ (303)
Other comprehensive loss, net of tax
Foreign currency adjustment	(44)	(59)	(41)
Minimum pension liability	(7)		(6)
Other comprehensive income (loss), net of tax	(51)	(59)	(47)
Total comprehensive (loss) income	(21)	(147)	(350)
Less: Income attributable to noncontrolling interest	(5)	(3)	(5)
Comprehensive (loss) income attributable to Warner Music Group Corp.	$ (26)	$ (150)	$ (355)