Investment Income, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 30, 2012	Dec. 25, 2011
Investment Income, Net [Abstract]
Interest and dividend income	$ 165	$ 130
Interest expense	(8)	(27)
Net realized gains on marketable securities	94	37
Net realized gains on other investments	2	7
Impairment losses on marketable securities	(5)	(14)
Impairment losses on other investments	(5)	(6)
(Losses) gains on derivative instruments	(1)	45
Equity in losses of investees	(3)	(2)
Investment income, net	$ 239	$ 170