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Employee Stock Plans (Employee Stock Purchase Plan) (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 29, 2017
USD ($)
stockplan
$ / shares
shares
Jan. 31, 2016
USD ($)
Feb. 01, 2015
USD ($)
ESPP Disclosures [Line Items]      
Number Of Employee Stock Purchase Plans | stockplan 2    
Purchase Price of Shares under ESPP in relation to FMV of Stock 85.00%    
Purchase Period 6 months    
Shares Purchased | shares 1    
Weighted Average Purchase Price of Shares Purchased | $ / shares $ 111.14    
Employee Cash Contributions | $ $ 15    
Share-based Compensation Expense | $ $ 267 $ 244 $ 225
U.S. ESPP Plan [Member]      
ESPP Disclosures [Line Items]      
Shares Available for Future Grants | shares 21    
Non U.S. ESPP Plan [Member]      
ESPP Disclosures [Line Items]      
Shares Available for Future Grants | shares 19    
ESPP [Member]      
ESPP Disclosures [Line Items]      
Share-based Compensation Expense | $ $ 26 $ 23 $ 20