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Supplemental Financial Information - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 26, 2019 | Apr. 24, 2020 | Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018 | Sep. 30, 2017
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Land and buildings held for sale |  |  |  |  |  | $ 118
Sale price of properties |  |  |  |  |  | $ 306
Net book value |  | $ 727 | $ 727 | $ 759 |  |
Cash proceeds from properties sold |  |  | 96 | $ 0 | $ 210 |
Investments, other-than-temporary impairment charge |  | 10 |  |  |  |
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 | 7 |  |  |
Fair value of equity interest |  | 80 | 80 |  |  |
Gain on derecognition of assets |  |  | 73 |  |  |
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 |
Land |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Cash proceeds from properties sold | $ 96 |  |  |  |  |
Gain on sale of properties, net of direct selling costs | 38 |  |  |  |  |
Other Current Assets | Land |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Net book value | $ 53 |  |  |  |  |
Other Non- Current Assets |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Book value of investments |  | $ 67 | $ 67 | $ 78 |  |

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