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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2021 | Jan. 26, 2020 | Jan. 27, 2019 | Jul. 26, 2020 | Jan. 28, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ 77 | $ 174 | $ (245) |  |
Effective tax rate (as percent) | 1.70% | 5.90% | (6.30%) |  |
Deferred tax assets, valuation allowance | $ 728 | $ 621 |  |  |
Gross unrecognized tax benefits | 776 | 583 | $ 477 |  | $ 447
Unrecognized tax benefits that would affect effective tax rate | 606 |  |  |  |
Unrecognized tax benefit related to state tax positions | 132 |  |  |  |
Reduction of deferred tax asset included in unrecognized tax benefit | 249 |  |  |  |
Interest and penalties | 44 | $ 31 | $ 21 |  |
Other long-term liabilities |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized tax benefits that would affect effective tax rate | 352 |  |  |  |
Interest and penalties | 43 |  |  |  |
Accrued and other current liabilities |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized tax benefits that would affect effective tax rate | 5 |  |  |  |
Interest and penalties | 1 |  |  |  |
Mellanox Technologies, Ltd |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Deferred tax liabilities, intangibles and undistributed earnings from foreign subsidiaries |  |  |  | $ 256 |
Deferred liabilities, inside basis difference in acquired business |  |  |  | $ 153 |
Undistributed earnings of foreign subsidiaries | 1,160 |  |  |  |
Federal |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carryforwards | 333 |  |  |  |
Research tax credit carryforwards | 238 |  |  |  |
Foreign Country |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carryforwards | 344 |  |  |  |
State and Local Jurisdiction |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carryforwards | 308 |  |  |  |
Research tax credit carryforwards | 987 |  |  |  |
California |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Research tax credit carryforwards | 944 |  |  |  |
Other states |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Research tax credit carryforwards | $ 43 |  |  |  |

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