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Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 29, 2016
Jan. 23, 2015
Jan. 29, 2016
Jan. 23, 2015
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period     $ 0  
Net charges $ 0 $ 0 28 $ 0
Cash payments     (28)  
Balance at end of period 0   0  
Employee Severance Related Costs        
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period     0  
Net charges     25  
Cash payments     (25)  
Balance at end of period 0   0  
Other        
Restructuring Cost and Reserve [Line Items]        
Balance at beginning of period     0  
Net charges     3  
Cash payments     (3)  
Balance at end of period $ 0   $ 0