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Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 30, 2015
Oct. 24, 2014
Oct. 30, 2015
Oct. 24, 2014
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period     $ 0  
Net charges $ 1 $ 0 28 $ 0
Cash payments     (23)  
Balance at end of period 5   5  
Employee Severance Related Costs        
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period     0  
Net charges     25  
Cash payments     (22)  
Balance at end of period 3   3  
Other        
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period     0  
Net charges     3  
Cash payments     (1)  
Balance at end of period $ 2   $ 2