Goodwill and Intangible Assets - Schedule of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Sep. 30, 2013
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 3,600	$ 3,542
Accumulated amortization	(569)	(435)
Total net intangible assets subject to amortization	3,031	3,107
Intangible assets not subject to amortization	120	120
Total net other intangible assets	3,151	3,227
Trademarks and Trade Names
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
Intangible assets subject to amortization, gross	1,023	1,006
Music Publishing copyrights
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	28 years
Intangible assets subject to amortization, gross	1,577	1,546
Artist and songwriter contracts
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	13 years
Intangible assets subject to amortization, gross	993	983
Trademarks
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Useful Life	7 years
Intangible assets subject to amortization, gross	$ 7	$ 7