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Restructuring Charges - Activities Related to Restructuring Reserves (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2021
Apr. 24, 2020
Apr. 26, 2019
Restructuring And Related Activities [Abstract]      
Balance at beginning of period $ 1 $ 19 $ 6
Net charges 42 21 35
Cash payments (42) (35) (22)
Other   (4)  
Balance at end of period $ 1 $ 1 $ 19