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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. 25, 2019
Jan. 26, 2018
Jan. 25, 2019
Jan. 26, 2018
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     $ 2,276  
Other comprehensive income (loss), net of tax     3  
Amounts reclassified from AOCI, net of tax     (1)  
Other comprehensive income (loss) $ 7 $ (23) 2 $ (13)
Ending balance 1,230   1,230  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     (27)  
Other comprehensive income (loss), net of tax     (4)  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive income (loss)     (4)  
Ending balance (31)   (31)  
Defined Benefit Obligation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     0  
Other comprehensive income (loss), net of tax     0  
Amounts reclassified from AOCI, net of tax     (1)  
Other comprehensive income (loss)     (1)  
Ending balance (1)   (1)  
Unrealized Gains (Losses) on Available-for-Sale Securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     (43)  
Other comprehensive income (loss), net of tax     7  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive income (loss)     7  
Ending balance (36)   (36)  
Accumulated Other Comprehensive Income (Loss) Attributable to Parent        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     (70)  
Ending balance $ (68)   $ (68)