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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 30, 2015
Oct. 24, 2014
Apr. 24, 2015
Apr. 25, 2014
Income Tax Contingency [Line Items]          
Gross unrecognized tax benefits $ 209 $ 209 $ 275 $ 272 $ 236
Unrecognized tax benefits included in other long-term liabilities 158 158      
Unrecognized tax benefits that would affect provision for income taxes 148 148      
Federal Income Tax          
Income Tax Contingency [Line Items]          
Resolution of income tax examinations $ 10 23 $ 47    
United Kingdom          
Income Tax Contingency [Line Items]          
Resolution of income tax examinations   $ (1)