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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. 24, 2020
Jan. 25, 2019
Jan. 24, 2020
Jan. 25, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balances $ 536 $ 1,530 $ 1,090 $ 2,276
Other comprehensive income (loss), net of tax     19  
Amounts reclassified from AOCI, net of tax     (15)  
Other comprehensive income (loss) (3) 7 4 2
Balances 282 1,230 282 1,230
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balances     (34)  
Other comprehensive income (loss), net of tax     (2)  
Amounts reclassified from AOCI, net of tax     0  
Other comprehensive income (loss)     (2)  
Balances (36)   (36)  
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     (1)  
Other comprehensive income (loss)     (1)  
Balances (4)   (4)  
Unrealized Gains (Losses) on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balances     (7)  
Other comprehensive income (loss), net of tax     22  
Amounts reclassified from AOCI, net of tax     (14)  
Other comprehensive income (loss)     8  
Balances 1   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 (loss)     (1)  
Balances 0   0  
AOCI Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balances (36) (75) (43) (70)
Other comprehensive income (loss) (3) 7 4 2
Balances $ (39) $ (68) $ (39) $ (68)