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Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 15 $ 23 $ 58 $ 76
Less: Income tax benefit (6) (8) (22) (29)
Share-based compensation expense, net of tax 9 15 36 47
Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 12 18 46 64
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 2 3 8 8
Employee stock purchase plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1 $ 2 $ 4 $ 4