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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Net Income Per Common Share [Line Items]      
Income from continuing operations $ 14,293 $ 15,080 $ 16,814
Income from continuing operations attributable to noncontrolling interest (650) (386) (632)
Income from continuing operations attributable to Walmart $ 13,643 $ 14,694 $ 16,182
Weighted-average common shares outstanding, basic 3,101 3,207 3,230
Dilutive impact of stock options and other share-based awards 11 10 13
Weighted-average common shares outstanding, diluted 3,112 3,217 3,243
Basic income per common share from continuing operations attributable to Walmart $ 4.40 $ 4.58 $ 5.01
Diluted income per common share from continuing operations attributable to Walmart $ 4.38 $ 4.57 $ 4.99