Income Taxes - Narrative (Details) - USD ($)	3 Months Ended			12 Months Ended			14 Months Ended
	Jan. 27, 2019	Oct. 28, 2018	Jan. 28, 2018	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017	Jan. 27, 2019	Jan. 31, 2016
Income Tax Contingency [Line Items]
U.S. federal statutory income tax rate (as percent)				21.00%	33.90%	35.00%
Income tax expense (benefit)				$ (245,000,000)	$ 149,000,000	$ 239,000,000
Effective tax rate (as percent)				(6.30%)	4.70%	12.50%
Reduction to provisional amount recorded				$ 368,000,000
Tax benefit for TCJA	$ 230,000,000	$ 138,000,000	$ 133,000,000	368,000,000	$ 133,000,000	$ 0	$ 501,000,000
Provisional one-time transition tax liability related to post-1986 earnings and profits of foreign subsidiaries					971,000,000
Tax liability related to post-1986 earnings and profits of foreign subsidiaries				33,000,000
Provisional tax expense (benefit) related to deferred tax balance					43,000,000
Reduction to tax expense related to deferred tax balance				20,000,000
Tax expense (benefit) related to GILTI-related deferred taxes				(370,000,000)	0
Deferred tax assets, valuation allowance	562,000,000		469,000,000	562,000,000	469,000,000		562,000,000
Gross unrecognized tax benefits	477,000,000		447,000,000	477,000,000	447,000,000	224,000,000	477,000,000	$ 230,000,000
Unrecognized tax benefits that would affect effective tax rate	432,000,000			432,000,000			432,000,000
Unrecognized tax benefit related to state tax positions	82,000,000			82,000,000			82,000,000
Unrecognized tax benefits, non-current	142,000,000			142,000,000			142,000,000
Reduction of deferred tax asset included in unrecognized tax benefit	290,000,000			290,000,000			290,000,000
Interest and penalties	21,000,000		$ 15,000,000	21,000,000	$ 15,000,000	$ 13,000,000	21,000,000
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	72,000,000			72,000,000			72,000,000
Research tax credit carryforwards	347,000,000			347,000,000			347,000,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforwards	291,000,000			291,000,000			291,000,000
Research tax credit carryforwards	718,000,000			718,000,000			718,000,000
California
Income Tax Contingency [Line Items]
Research tax credit carryforwards	687,000,000			687,000,000			687,000,000
Other states
Income Tax Contingency [Line Items]
Research tax credit carryforwards	31,000,000			31,000,000			31,000,000
Foreign Country
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 290,000,000			$ 290,000,000			$ 290,000,000