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Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions | Oct. 27, 2017 | Apr. 28, 2017
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Deferred Revenue And Credits [Line Items] |  |
Deferred revenue and financed unearned services revenue | $ 3,167 | $ 3,342
Short-term | 1,645 | 1,744
Long-term | 1,522 | 1,598
Deferred product revenue |  |
Deferred Revenue And Credits [Line Items] |  |
Deferred revenue and financed unearned services revenue | 123 | 124
Deferred services revenue |  |
Deferred Revenue And Credits [Line Items] |  |
Deferred revenue and financed unearned services revenue | 2,881 | 2,999
Financed unearned services revenue |  |
Deferred Revenue And Credits [Line Items] |  |
Deferred revenue and financed unearned services revenue | $ 163 | $ 219

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