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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 24, 2020
Apr. 26, 2019
Apr. 27, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances $ 1,090 $ 2,276 $ 2,949
OCI before reclassifications, net of tax 22 29  
Amounts reclassified from AOCI, net of tax (21) (2)  
Other comprehensive income (loss): 1 27 (41)
Balances 242 1,090 2,276
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (34) (27)  
OCI before reclassifications, net of tax (8) (7)  
Amounts reclassified from AOCI, net of tax 0 0  
Other comprehensive income (loss): (8) (7)  
Balances (42) (34) (27)
Defined Benefit Obligation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (3) 0  
OCI before reclassifications, net of tax 3 (2)  
Amounts reclassified from AOCI, net of tax (1) (1)  
Other comprehensive income (loss): 2 (3)  
Balances (1) (3) 0
Unrealized Gains (Losses) on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (7) (43)  
OCI before reclassifications, net of tax 22 36  
Amounts reclassified from AOCI, net of tax (14) 0  
Other comprehensive income (loss): 8 36  
Balances 1 (7) (43)
Unrealized Gains (Losses) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances 1 0  
OCI before reclassifications, net of tax 5 2  
Amounts reclassified from AOCI, net of tax (6) (1)  
Other comprehensive income (loss): (1) 1  
Balances 0 1 0
AOCI Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (43) (70) (29)
Other comprehensive income (loss): 1 27 (41)
Balances $ (42) $ (43) $ (70)