Components of Gross and Net Acquired Intangible Asset Balances (Detail) - USD ($) $ in Millions	Mar. 26, 2016	Sep. 26, 2015
Acquired Intangible Assets [Line Items]
Definite-lived and amortizable acquired intangible assets, Gross Carrying Amount	$ 8,797	$ 8,125
Definite-lived and amortizable acquired intangible assets, Accumulated Amortization	(5,054)	(4,332)
Definite-lived and amortizable acquired intangible assets, Net Carrying Amount	3,743	3,793
Indefinite-lived and non-amortizable acquired intangible assets	100	100
Total acquired intangible assets, Net Carrying Amount	$ 3,843	$ 3,893