Inventory (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Inventory Net [Line Items]
Original programming released, net of amortization	$ 1,312	$ 1,183
Original programming, in process and other	474	513
Total original programming inventory, net of amortization	1,786	1,696
Theatrical released, net of amortization	721	812
Theatrical completed, not yet released	31	139
Theatrical in process and other	704	529
Total theatrical inventory, net of amortization	1,456	1,480
Acquired program rights, net of amortization	1,680	1,760
Merchandise and other inventory, net of allowances of $73 and $73	132	131
Total inventory, net	5,054	5,067
Less current portion	(841)	(828)
Total inventory - noncurrent, net	4,213	4,239
Inventory Valuation Reserves	$ 74	$ 73