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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 6 Months Ended
Jul. 30, 2017
Jul. 31, 2016
Jul. 30, 2017
Jul. 31, 2016
Reconciliation of Basic to Diluted Weighted Average Common Shares:        
Basic Weighted Average Common Shares 1,183 1,235 1,191 1,242
Effect of potentially dilutive securities - stock plans 6 5 6 5
Diluted Weighted Average Common Shares 1,189 1,240 1,197 1,247