Equity in Income of Investees by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Schedule of Equity Method Investments [Line Items]
Equity in income of investees	$ 627	$ 585	$ 440
Media Networks | Cable
Schedule of Equity Method Investments [Line Items]
Equity in income of investees	664	578	436
Media Networks | Broadcasting
Schedule of Equity Method Investments [Line Items]
Equity in income of investees	(37)	6	2
Corporate
Schedule of Equity Method Investments [Line Items]
Equity in income of investees		$ 1	$ 2