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Income Taxes - Additional Information (Detail) $ in Millions | Jun. 11, 2014 Subsidiary | Jun. 27, 2015 USD ($) | Sep. 27, 2014 USD ($)
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Income Tax Contingency [Line Items] |  |  |
Gross unrecognized tax benefits |  | $ 5,400 | $ 4,000
Gross unrecognized tax benefits that would affect effective tax rate, if recognized |  | 2,000 | 1,400
Unrecognized tax benefits, gross interest and penalties accrued |  | $ 928 | $ 630
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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