Investments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Investments [Abstract]
Excess book value of equity method investments representing intangible assets and goodwill	$ 500
Securities classified as available-for-sale	36	$ 100
Non-publicly traded cost-method investments	81	81
Investments in leveraged leases	43	39
Realized gains on available-for-sale securities	31	165	$ 40
Realized gains on non-publicly traded cost-method investments	11	53
Other-than-temporary losses in value of certain investments	$ 14	$ 13	$ 37