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Revenue - Summary of Activity Related to Deferred Commissions (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2020
Jul. 26, 2019
Deferred Revenue Disclosure [Abstract]    
Balance at beginning of period $ 156 $ 172
Additions 21 16
Expense recognized during the period (25) (25)
Balance at end of period $ 152 $ 163