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Weighted Average Common Shares (Schedule of Antidilutive Securities From Computation Of Earnings Per Share) (Details) - shares
shares in Millions
12 Months Ended
Jan. 28, 2018
Jan. 29, 2017
Jan. 31, 2016
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Effect of anti-dilutive securities excluded from diluted weighted average common shares 1 1 1