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Revenue - Summary of Components of Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions | Oct. 26, 2018 | Apr. 27, 2018 | Oct. 27, 2017 | Apr. 28, 2017
--- | --- | --- | --- | ---
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | $ 3,206 | $ 3,363 | $ 3,059 | $ 3,213
Short-term | 1,538 | 1,712 |  |
Long-term | 1,668 | 1,651 |  |
Deferred product revenue |  |  |  |
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | 102 | 107 |  |
Deferred services revenue |  |  |  |
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | 3,010 | 3,134 |  |
Financed unearned services revenue |  |  |  |
Contract With Customer Liability [Line Items] |  |  |  |
Deferred revenue and financed unearned services revenue | $ 94 | $ 122 |  |

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