Composition of Certain Financial Statement Items Investment and Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Mar. 29, 2020	Mar. 31, 2019
Investment Income, Net [Abstract]
Interest and dividend income	$ 47	$ 78	$ 107	$ 143
Net gains (losses) on marketable securities	55	5	66	(19)
Net (losses) gains on other investments	(12)	6	36	42
Net (losses) gains on deferred compensation plan assets	(72)	37	(42)	(2)
Impairment losses on other investments	(265)	(60)	(337)	(69)
Net (losses) gains on derivative investments	0	(1)	1	(9)
Equity in net losses of investees	(6)	(36)	(16)	(58)
Net gains (losses) on foreign currency transactions	6	(1)	3	5
Investment and other (expense) income, net	$ (247)	$ 28	$ (182)	$ 33