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Stock-Based Compensation (Summary Of Performance Share Unit Activity) (Details) (Performance Share Units [Member], USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Jan. 28, 2012
Performance Share Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, beginning of year 199,186
Granted 60,934
Vested but unearned   
Vested and earned (132,752)
Cancelled   
Outstanding, end of year 127,368
Total fair value of performance share units earned $ 6
Total fair value of performance share units settled or to be settled in cash $ 6