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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 9 Months Ended
Oct. 28, 2018
Oct. 29, 2017
Oct. 28, 2018
Oct. 29, 2017
Reconciliation of Basic to Diluted Weighted Average Common Shares:        
Basic weighted average common shares 1,135 1,168 1,144 1,184
Effect of potentially dilutive securities 6 6 6 6
Diluted weighted average common shares 1,141 1,174 1,150 1,190