Composition of Certain Financial Statement Items Investment Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Investment Income, Net [Abstract]
Interest and dividend income	$ 128	$ 139	$ 400	$ 460
Interest expense	(32)	0	(34)	(4)
Net realized gains on marketable securities	117	290	381	660
Net realized gains on other investments	5	8	18	25
Impairment losses on marketable securities	(42)	(8)	(131)	(149)
Impairment losses on other investments	(13)	(3)	(30)	(21)
Net gains (losses) on derivative instruments	10	(6)	16	(1)
Equity in net losses of investees	(10)	(2)	(23)	(7)
Net gains on deconsolidation of subsidiaries	0	4	3	5
Investment income, net	$ 163	$ 422	$ 600	$ 968