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Income Taxes - Additional Information (Detail) $ in Millions | Jun. 11, 2014 Subsidiary | Jun. 25, 2016 USD ($) | Sep. 26, 2015 USD ($)
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Income Tax Contingency [Line Items] |  |  |
Gross unrecognized tax benefits |  | $ 7,600 | $ 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 gross unrecognized tax benefits over 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 |  |

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