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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. 29, 2018
Jul. 30, 2017
Jul. 29, 2018
Jul. 30, 2017
Reconciliation of Basic to Diluted Weighted Average Common Shares:        
Basic weighted average common shares 1,144 1,183 1,148 1,191
Effect of potentially dilutive securities 5 6 6 6
Diluted weighted average common shares 1,149 1,189 1,154 1,197