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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jul. 29, 2016
Jul. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (31)  
OCI before reclassifications, net of tax 0  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (loss): 0 $ (10)
Ending balance (31)  
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (19)  
OCI before reclassifications, net of tax (6)  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (loss): (6)  
Ending balance (25)  
Defined Benefit Obligation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (16)  
OCI before reclassifications, net of tax 0  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (loss): 0  
Ending balance (16)  
Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 6  
OCI before reclassifications, net of tax 3  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (loss): 3  
Ending balance 9  
Unrealized Gains (Losses) on Derivative Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (2)  
OCI before reclassifications, net of tax 3  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (loss): 3  
Ending balance $ 1