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Restructuring Charges - Activities Related to Restructuring Reserves (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 24, 2020
Apr. 26, 2019
Apr. 27, 2018
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period $ 19 $ 6 $ 13
Net charges 21 35 0
Cash payments (35) (22) (7)
Other (4)    
Balance at end of period 1 19 6
May 2019 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0 0 0
Net charges 21 0 0
Cash payments (20) 0 0
Other 0    
Balance at end of period 1 0 0
April 2019 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 15 0 0
Net charges 0 16 0
Cash payments (15) (1) 0
Other 0    
Balance at end of period 0 15 0
May 2018 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0 0 0
Net charges 0 19 0
Cash payments 0 (19) 0
Other 0    
Balance at end of period 0 0 0
November 2016 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 4 6 13
Net charges 0 0 0
Cash payments 0 (2) (7)
Other (4)    
Balance at end of period $ 0 $ 4 $ 6