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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. 29, 2016
Jan. 23, 2015
Jan. 29, 2016
Jan. 23, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (24)  
OCI before reclassifications, net of tax     (18)  
Amounts reclassified from AOCI, net of tax     1  
Other comprehensive loss $ (6) $ (15) (17) $ (23)
Ending balance (41)   (41)  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (23)  
OCI before reclassifications, net of tax     (7)  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive loss     (7)  
Ending balance (30)   (30)  
Defined Benefit Obligation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (13)  
OCI before reclassifications, net of tax     0  
Amounts reclassified from AOCI, net of tax     2  
Other comprehensive loss     2  
Ending balance (11)   (11)  
Unrealized Gains (Losses) on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     11  
OCI before reclassifications, net of tax     (11)  
Amounts reclassified from AOCI, net of tax     (1)  
Other comprehensive loss     (12)  
Ending balance (1)   (1)  
Unrealized Gains (Losses) on Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     1  
OCI before reclassifications, net of tax     0  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive loss     0  
Ending balance $ 1   $ 1