Components of Gross and Net Acquired Intangible Asset Balances (Detail) - USD ($) $ in Millions	Dec. 26, 2015	Sep. 26, 2015
Acquired Intangible Assets [Line Items]
Definite-lived and amortizable acquired intangible assets, Gross Carrying Amount	$ 8,490	$ 8,125
Definite-lived and amortizable acquired intangible assets, Accumulated Amortization	(4,666)	(4,332)
Definite-lived and amortizable acquired intangible assets, Net Carrying Amount	3,824	3,793
Indefinite-lived and non-amortizable acquired intangible assets	100	100
Total acquired intangible assets, Net Carrying Amount	$ 3,924	$ 3,893