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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
Apr. 29, 2018
Apr. 30, 2017
Reconciliation of Basic to Diluted Weighted Average Common Shares:    
Basic weighted average common shares 1,152 1,198
Effect of potentially dilutive securities 6 6
Diluted weighted average common shares 1,158 1,204