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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2020
Jul. 26, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances $ 242 $ 1,090
Other comprehensive income (loss), net of tax 2  
Amounts reclassified from AOCI, net of tax 1  
Other comprehensive income 3 4
Balances 284 863
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (42)  
Other comprehensive income (loss), net of tax 9  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income 9  
Balances (33)  
Defined Benefit Obligation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (1)  
Other comprehensive income (loss), net of tax 0  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income 0  
Balances (1)  
Unrealized Gains (Losses) on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances 1  
Other comprehensive income (loss), net of tax 2  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income 2  
Balances 3  
Unrealized Gains (Losses) on Derivative Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances 0  
Other comprehensive income (loss), net of tax (9)  
Amounts reclassified from AOCI, net of tax 1  
Other comprehensive income (8)  
Balances (8)  
AOCI Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (42) (43)
Other comprehensive income 3 4
Balances $ (39) $ (39)