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Leases - Components of Lease Cost Related to Operating Leases (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 30, 2020
Oct. 25, 2019
Oct. 30, 2020
Oct. 25, 2019
Leases [Abstract]        
Operating lease cost $ 14 $ 15 $ 28 $ 29
Variable lease cost 2 4 5 8
Total lease cost $ 16 $ 19 $ 33 $ 37