Income Taxes - Deferred Taxes (Details) - USD ($)		Jan. 27, 2019	Jan. 28, 2018
Deferred tax assets:
Net operating loss carryforwards		$ 70,000,000	$ 67,000,000
Accruals and reserves, not currently deductible for tax purposes		41,000,000	24,000,000
Property, equipment and intangible assets		2,000,000	32,000,000
Research and other tax credit carryforwards		626,000,000	579,000,000
Stock-based compensation		25,000,000	24,000,000
GILTI deferred tax assets		376,000,000	0
Gross deferred tax assets		1,140,000,000	726,000,000
Less valuation allowance		(562,000,000)	(469,000,000)
Total deferred tax assets		578,000,000	257,000,000
Deferred tax liabilities:
Acquired intangibles		(2,000,000)	(4,000,000)
Unremitted earnings of foreign subsidiaries		(35,000,000)	(26,000,000)
Gross deferred tax liabilities		(37,000,000)	(30,000,000)
Net deferred tax asset	[1]	541,000,000	227,000,000
Deferred tax liability		19,000,000	18,000,000
Other assets
Deferred tax liabilities:
Deferred tax asset	[1]	560,000,000	245,000,000
Other long-term liabilities
Deferred tax liabilities:
Deferred tax liability	[1]	$ 19,000,000	$ 18,000,000

[1] Net deferred tax asset includes long-term deferred tax assets of $560 million and $245 million and long-term deferred tax liabilities of $19 million and $18 million for fiscal years 2019 and 2018, respectively. Long-term deferred tax assets are included in Other assets and long-term deferred tax liabilities are included in Other long-term liabilities on our Consolidated Balance Sheets.