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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Net Income Per Common Share [Line Items]    
Income from continuing operations $ 3,216 $ 3,283
Consolidated net income attributable to noncontrolling interest (137) 58
Income from continuing operations attributable to Walmart $ 3,079 $ 3,341
Weighted-average common shares outstanding, basic 3,144 3,231
Dilutive impact of stock options and other share-based awards 10 12
Weighted-average common shares outstanding, diluted 3,154 3,243
Basic income per common share from continuing operations attributable to Walmart $ 0.98 $ 1.03
Diluted income per common share from continuing operations attributable to Walmart $ 0.98 $ 1.03