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Income Taxes - Additional Information (Detail)
$ in Millions
Jun. 11, 2014
Subsidiary
Jun. 25, 2016
USD ($)
Sep. 26, 2015
USD ($)
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