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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
12 Months Ended
Jan. 29, 2017
Jan. 31, 2016
Feb. 01, 2015
Reconciliation of Basic to Diluted Weighted Average Common Shares:      
Weighted average common shares 1,229 1,277 1,338
Effect of potentially dilutive securities: Stock plans 5 6 8
Diluted weighted average common shares 1,234 1,283 1,346