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Revenue - Summary of Components of Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions | Jan. 24, 2020 | Apr. 26, 2019 | Jan. 25, 2019 | Apr. 27, 2018
--- | --- | --- | --- | ---
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | $ 3,573 | $ 3,668 | $ 3,357 | $ 3,363
Short-term | 1,795 | 1,825 |  |
Long-term | 1,778 | 1,843 |  |
Deferred product revenue |  |  |  |
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | 73 | 84 |  |
Deferred services revenue |  |  |  |
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | 3,439 | 3,502 |  |
Financed unearned services revenue |  |  |  |
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | $ 61 | $ 82 |  |

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