Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Total gross intangible asset subject to amortization	$ 3,572	$ 3,542
Accumulated amortization	(688)	(435)
Total net intangible assets subject to amortization	2,884	3,107
Intangible assets not subject to amortization	120	120
Total net other intangible assets	3,004	3,227
Trademarks and tradenames
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	120	120
Recorded Music catalog
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	11 years
Total gross intangible asset subject to amortization	1,040	1,006
Music Publishing copyrights
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	27 years
Total gross intangible asset subject to amortization	1,550	1,546
Artist and songwriter contracts
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	13 years
Total gross intangible asset subject to amortization	975	983
Trademarks
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	7 years
Total gross intangible asset subject to amortization	$ 7	$ 7