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Stock-Based Compensation (Summary Of Grants) (Details) - $ / shares
shares in Millions
9 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (in shares) 2.9 1.8
Weighted-average grant-date fair value per stock option (in dollars per share) $ 15 $ 21
Stock options special dividend adjustment 0.0 0.9
Restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Units granted (in shares) 1.9 0.5
Weighted-average grant-date fair value per unit (in dollars per share) $ 44 $ 77
Restricted stock units special dividend adjustment 0.0 0.1
Performance share units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Units granted (in shares) [1] 0.1 0.1
Weighted-average grant-date fair value per unit (in dollars per share) [1] $ 44  
[1] Performance share units granted in 2015 were liability-based awards, therefore the weighted-average grant-date fair value is not meaningful.