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Deferred Income Tax Liabilities, Intangibles And Undistributed Earnings From Foreign Subsidiaries

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Reduction of deferred tax asset included in unrecognized tax benefit

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Unrecognized tax benefits related to state income tax positions

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	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