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 |