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Share-based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Options, restricted and unrestricted shares authorized 160    
Options and shares available for grant 16    
Cash received from stock options exercised $ 20 $ 33 $ 35
Tax Benefit associated with share based compensation 32 33 30
Stock Options [Member]      
Total intrinsic value of options exercised 30 63 52
Total fair value at grant date of option awards vested 10 $ 11 $ 11
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 17    
Weighted average fair value of stock options granted $ 11.72 $ 15.27 $ 11.74
Cash received from stock options exercised $ 20 $ 33 $ 35
Total unrecognized compensation cost, weighted-average period of recognition, years 2 years 340 days    
Tax benefits realized from tax deductions $ 9 20 21
Restricted Stock [Member]      
Total intrinsic value of restricted stock vested 140 217 128
Total fair value at grant date of awards vested 68 80 56
Total unrecognized compensation cost, net of estimated forfeitures $ 141    
Total unrecognized compensation cost, weighted-average period of recognition, years 2 years 8 months 15 days    
Tax benefits realized from tax deductions $ 61 $ 82 $ 46