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Share-based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Options, restricted and unrestricted shares authorized 160    
Options and shares available for grant 12    
Cash received from stock options exercised $ 38 $ 20 $ 33
Tax Benefit associated with share based compensation 23 32 33
Stock Options [Member]      
Total intrinsic value of options exercised 44 30 63
Total fair value at grant date of option awards vested 10 $ 10 $ 11
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 14    
Weighted average fair value of stock options granted $ 5.96 $ 11.72 $ 15.27
Cash received from stock options exercised $ 38 $ 20 $ 33
Total unrecognized compensation cost, weighted-average period of recognition, years 2 years 201 days    
Tax benefits realized from tax deductions $ 16 9 20
Restricted Stock [Member]      
Total intrinsic value of restricted stock vested 86 140 217
Total fair value at grant date of awards vested 87 68 80
Total unrecognized compensation cost, net of estimated forfeitures $ 134    
Total unrecognized compensation cost, weighted-average period of recognition, years 2 years 6 months 19 days    
Tax benefits realized from tax deductions $ 32 $ 61 $ 82