Investment Income Investment Income (Loss) Table (Details) (USD $) In Millions	12 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 27, 2009
Investment Income (Loss), Net [Line Items]
Interest and dividend income	$ 500	$ 530	$ 516
Interest expense	(114)	(43)	(13)
Net realized gains on marketable securities	335	401	136
Net realized gains on other investments	2	4	1
Impairment losses on marketable securities	(39)	(111)	(743)
Impairment losses on other investments	(13)	(14)	(20)
(Losses) gains on derivative instruments	(3)	3	1
Equity in losses of investees	(7)	(4)	(17)
Investment income (loss), net	$ 661	$ 766	$ (139)