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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 29, 2017
Jan. 31, 2016
Jan. 25, 2015
Jan. 26, 2014
Schedule of Available-for-sale Securities [Line Items]        
Advertising Expense $ 17 $ 30 $ 21  
Foreign Currency Transaction Loss, Realized 5      
Deferred Tax Assets, Valuation Allowance 353 [1] 272    
Cash and cash equivalents 1,766 596 $ 497 $ 1,152
Available-for-sale Securities, Amortized Cost $ 5,484 $ 4,672    
Accounts receivable from significant customers (in percent) 29.00% 28.00%    
Number of customers that exceeded 10% of total consolidated accounts receivable 2 2    
New Accounting Pronouncement, Early Adoption [Line Items]        
Retained earnings adjustment due to adoption of an accounting standard related to stock-based compensation $ 353      
Excess Tax Benefit Related To Stock Based Compensation 82      
Full valuation allowance related to state net operating loss and state research credit carryforwards 63      
Retained Earnings        
New Accounting Pronouncement, Early Adoption [Line Items]        
Retained earnings adjustment due to adoption of an accounting standard related to stock-based compensation 353      
Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2016-09 [Member] | Retained Earnings        
New Accounting Pronouncement, Early Adoption [Line Items]        
Retained earnings adjustment due to adoption of an accounting standard related to stock-based compensation   $ 353    
Money Market Funds        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost $ 321 $ 43    
[1] Balances as of January 29, 2017 reflect the adoption of an accounting standard related to stock-based compensation. Please refer to Note 1 of these Notes to the Consolidated Financial Statements for additional information.