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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Numerator    
Consolidated net income $ 1,896 $ 2,103
Consolidated net income attributable to noncontrolling interest (223) (49)
Consolidated net income attributable to Walmart $ 1,673 $ 2,054
Denominator    
Weighted-average common shares outstanding, basic (in shares) 2,694 2,754
Dilutive impact of share-based awards (in shares) 10 11
Weighted-average common shares outstanding, diluted (in shares) 2,704 2,765
Net income per common share attributable to Walmart    
Basic (in dollars per share) $ 0.62 $ 0.75
Diluted (in dollars per share) $ 0.62 $ 0.74