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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 27, 2017
Jan. 29, 2016
Jan. 27, 2017
Jan. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 2,881  
OCI before reclassifications, net of tax     (1)  
Amounts reclassified from AOCI, net of tax     (5)  
Other comprehensive income (loss): $ 4 $ (6) (6) $ (17)
Ending balance 2,694   2,694  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (19)  
OCI before reclassifications, net of tax     (14)  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive income (loss):     (14)  
Ending balance (33)   (33)  
Defined Benefit Obligation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance [1]     (16)  
OCI before reclassifications, net of tax [1]     15  
Amounts reclassified from AOCI, net of tax [1]     1  
Other comprehensive income (loss): [1]     16  
Ending balance [1] 0   0  
Unrealized Gains (Losses) on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     6  
OCI before reclassifications, net of tax     (10)  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive income (loss):     (10)  
Ending balance (4)   (4)  
Unrealized Gains (Losses) on Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (2)  
OCI before reclassifications, net of tax     8  
Amounts reclassified from AOCI, net of tax     (6)  
Other comprehensive income (loss):     2  
Ending balance 0   0  
AOCI Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (31)  
Ending balance $ (37)   $ (37)  
[1] See Note 15 – Employee Benefits for details of defined benefit obligation adjustments resulting from amendments made to our postretirement healthcare plan.