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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 26, 2019
Jul. 27, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances $ 1,090 $ 2,276
Other comprehensive income (loss), net of tax 18  
Amounts reclassified from AOCI, net of tax (14)  
Other comprehensive income 4 0
Balances 863 1,922
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (34)  
Other comprehensive income (loss), net of tax (1)  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (1)  
Balances (35)  
Defined Benefit Obligation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (3)  
Other comprehensive income (loss), net of tax 0  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income 0  
Balances (3)  
Unrealized Gains (Losses) on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (7)  
Other comprehensive income (loss), net of tax 20  
Amounts reclassified from AOCI, net of tax (14)  
Other comprehensive income 6  
Balances (1)  
Unrealized Gains (Losses) on Derivative Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances 1  
Other comprehensive income (loss), net of tax (1)  
Amounts reclassified from AOCI, net of tax 0  
Other comprehensive income (1)  
Balances 0  
AOCI Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balances (43) (70)
Other comprehensive income 4  
Balances $ (39) $ (70)