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Share-Based Compensation Expense (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 34 $ 16 $ 87 $ 50
Less: Income tax benefit (13) (7) (33) (20)
Share-based compensation expense, net of tax 21 9 54 30
Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options 28 11 71 35
Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options 5 4 13 12
Employee stock purchase plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options $ 1 $ 1 $ 3 $ 3