Supplemental Financial Information - Summary of Components of Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Oct. 29, 2021	Apr. 30, 2021	Oct. 30, 2020	Apr. 24, 2020
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,866	$ 4,003	$ 3,651	$ 3,698
Short-term	1,967	2,062
Long-term	1,899	1,941
Deferred product revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	47	59
Deferred services revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	3,758	3,873
Financed unearned services revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	$ 61	$ 71