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Employee Stock Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Jan. 28, 2018
USD ($)
years_old
shares
Jan. 29, 2017
USD ($)
shares
Jan. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of employee stock purchase plans 2    
Share-based compensation expense | $ $ 273 $ 267 $ 244
2005 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock authorized | shares 255,000,000    
Reduction in number of shares available for Issuance | shares 2.11    
Shares available for future grants | shares 130,000,000    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 25.00%    
Age at which award becomes non-forfeitable | years_old 60    
Number of outstanding options vested or expected to vest | shares 6,000,000    
Unrecognized stock-based compensation expense | $ $ 23    
Weighted average period over which unrecognized compensation will be recognized 2 years    
Award requisite service period 5 years    
Intrinsic value of option exercises in period | $ $ 223 $ 140 $ 206
Share-based compensation arrangement by share-based payment award, number of options outstanding | shares 7,196,000 8,720,000  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age at which award becomes non-forfeitable | years_old 60    
Unrecognized stock-based compensation expense | $ $ 337    
Weighted average period over which unrecognized compensation will be recognized 2 years    
Share-based compensation arrangement by share-based payment award, maximum period of restrictions lapse 5 years    
Percentage at which restricted stock lapse upon third and sixth anniversaries of date of issuance 25.00%    
Remaining percentage of the restricted stock lapsing upon the associate's attainment of age sixty two 50.00%    
Remaining percentage of restricted stock lapsing upon earlier of associate's attainment of age sixty or the tenth anniversary date 50.00%    
Age when remaining stock lapses if not tenth anniversary of grant date | years_old 60    
Age when remaining stock lapses | years_old 62    
Award requisite service period 5 years    
Deferred Compensation, Share-based Payments [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age at which award becomes non-forfeitable | years_old 60    
Award requisite service period 5 years