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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 27, 2017
Jan. 29, 2016
Jan. 27, 2017
Jan. 29, 2016
Apr. 29, 2016
Apr. 24, 2015
Income Tax Contingency [Line Items]            
Provision for income taxes $ 37 $ 10 $ 98 $ 48    
Gross unrecognized tax benefits 215 $ 216 215 216 $ 216 $ 272
Unrecognized tax benefits included in other long-term liabilities 147   147      
Unrecognized tax benefits that would affect provision for income taxes $ 157   157      
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     $ 18