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Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 27, 2017
Jul. 29, 2016
Jan. 29, 2016
Jan. 27, 2017
Jan. 29, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Provision for income taxes $ 37   $ 10 $ 98 $ 48
Accounting Standards Update 2016-09          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Provision for income taxes       $ 18  
Accounting Standards Update 2016-09 | Account for Forfeitures As Occur          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative-effect impact to retained earnings   $ 7      
Accounting Standards Update 2016-09 | Forfeiture Rate Policy Change On Outstanding Stock Based Awards          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative-effect adjustment to retained earnings   (3)      
Accounting Standards Update 2016-09 | Previously Unrecognized Tax Benefits          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Cumulative-effect adjustment to retained earnings   $ 17