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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 28, 2016
Oct. 30, 2015
Oct. 28, 2016
Oct. 30, 2015
Apr. 29, 2016
Apr. 24, 2015
Income Tax Contingency [Line Items]            
Provision for income taxes $ 33 $ 30 $ 61 $ 38    
Gross unrecognized tax benefits 212 $ 209 212 209 $ 216 $ 272
Unrecognized tax benefits included in other long-term liabilities 154   154      
Unrecognized tax benefits that would affect provision for income taxes $ 156   156      
Federal Income Tax            
Income Tax Contingency [Line Items]            
Resolution of income tax examinations       $ 23    
Accounting Standards Update 2016-09            
Income Tax Contingency [Line Items]            
Provision for income taxes     $ 17