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Earnings Per Share - Additional Information (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Earnings Per Share [Abstract]        
Shares excluded from the computations of weighted-average number of shares - diluted 0 16 2 12