Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Accounting Policies [Abstract]
Advertising expense	$ 25	$ 17	$ 30
Restructuring and other charges	0	3	131
Deferred tax assets, valuation allowance	469	353
Cash and cash equivalents	4,002	1,766	$ 596	$ 497
Cash equivalents	$ 3,789	$ 436
Accounts receivable from significant customers (in percent)	28.00%	29.00%
Number of customers that exceeded 10% of total consolidated accounts receivable	2	2
Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2016-16 [Member] | Retained Earnings
New Accounting Pronouncement, Early Adoption [Line Items]
Retained earnings adjustment due to adoption of an accounting standard	$ 28