Income Taxes - Additional Information (Detail) $ in Millions |
Jun. 11, 2014
Subsidiary
|
Mar. 26, 2016
USD ($)
|
Sep. 26, 2015
USD ($)
|
|---|---|---|---|
| Income Tax Contingency [Line Items] | |||
| Gross unrecognized tax benefits | $ 7,500 | $ 6,900 | |
| Gross unrecognized tax benefits that would affect effective tax rate, if recognized | 2,800 | 2,500 | |
| Unrecognized tax benefits, gross interest and penalties accrued | 1,500 | $ 1,300 | |
| Reasonably possible decrease in unrecognized tax benefits in the next 12 months | $ 800 | ||
| European Commission | |||
| Income Tax Contingency [Line Items] | |||
| Income Tax Contingency, Number of Subsidiaries | Subsidiary | 2 | ||
| European Commission | Maximum | |||
| Income Tax Contingency [Line Items] | |||
| Income Tax Contingency, Period of Occurrence | 10 years |