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Revenue - Summary of Components of Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions | Apr. 30, 2021 | Apr. 24, 2020 | Apr. 26, 2019
--- | --- | --- | ---
Contract With Customer Liability [Line Items] |  |  |
Deferred revenue and financed unearned services revenue | $ 4,003 | $ 3,698 | $ 3,668
Short-term | 2,062 | 1,894 |
Long-term | 1,941 | 1,804 |
Deferred product revenue |  |  |
Contract With Customer Liability [Line Items] |  |  |
Deferred revenue and financed unearned services revenue | 59 | 75 |
Deferred services revenue |  |  |
Contract With Customer Liability [Line Items] |  |  |
Deferred revenue and financed unearned services revenue | 3,873 | 3,567 |
Financed unearned services revenue |  |  |
Contract With Customer Liability [Line Items] |  |  |
Deferred revenue and financed unearned services revenue | $ 71 | $ 56 |

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