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Supplemental Financial Information - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 26, 2019 | Apr. 27, 2018 | Apr. 28, 2017 | Apr. 24, 2020 | Sep. 30, 2017
Property Plant And Equipment [Line Items] |  |  |  |  |
Land and buildings held for sale |  |  |  |  | $ 118
Sale price of properties |  |  |  |  | $ 306
Net book value | $ 759 | $ 756 |  |  |
Cash proceeds from properties sold | $ 0 | 210 | $ 0 |  |
Lenovo NetApp Technology Limited (“LNTL”) |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Non-controlling equity interest, ownership percentage | 49.00% |  |  |  |
Aggregate net book value of contributed assets | $ 7 |  |  |  |
Fair value of equity interest | 80 |  |  |  |
Gain on derecognition of assets | 73 |  |  |  |
Scenario, Forecast |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Sale of assets payments to be received |  |  |  | $ 96 |
Properties Sold |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Net book value |  | 66 |  |  |
Cash proceeds from properties sold |  | 210 |  |  |
Gain on sale of properties, net of direct selling costs | 142 |  |  |  |
Other Current Assets |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Land and buildings held for sale | $ 52 | $ 52 |  |  |

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