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Basic And Diluted Weighted Average Common Shares (Reconciliation Of Basic To Diluted Weighted Average Common Shares) (Details) - shares
shares in Millions
3 Months Ended
Apr. 30, 2017
May 01, 2016
Reconciliation of Basic to Diluted Weighted Average Common Shares:    
Weighted average common shares 1,198 1,247
Effect of potentially dilutive securities: Stock plans 6 5
Diluted weighted average common shares 1,204 1,252