Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Investments [Abstract]
Excess book value of equity method investments representing intangible assets and goodwill	$ 500,000,000
Securities classified as available-for-sale	100,000,000	305,000,000
Non-publicly traded cost-method investments	81,000,000	101,000,000
Investments in leveraged leases	39,000,000	36,000,000
Realized gains on available-for-sale securities	165,000,000	40,000,000
Realized gains on non-publicly traded cost-method investments	53,000,000
Other-than-temporary losses in value of certain investments	$ 13,000,000	$ 37,000,000	$ 11,000,000