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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2016
May. 02, 2015
Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of options vested $ 8 $ 11  
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant 12,050,000    
Stock Option Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received from options exercised $ 7 23  
Tax benefit realized from options exercised 5 $ 14  
Restricted Stock and Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost, net of estimated forfeitures $ 20    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 660,797 594,910  
Fair value of awards $ 7 $ 9  
Restricted stock outstanding 827,000   803,000
Awards vesting period description Generally, awards fully vest after the passage of time, typically three years. However, RSU awards made in connection with the Company's long-term incentive program vest after the attainment of both certain performance metrics and the passage of time.    
Nonvested Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost, net of estimated forfeitures $ 12    
Unrecognized compensation cost related to nonvested stock options, weighted-average period expected to be recognized 1 year 8 months 12 days