Net Income Per Common Share (Schedule of calculation of numerator and denominator in earnings per share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Numerator
Consolidated net income	$ 13,940	$ 13,706	$ 15,201
Consolidated net income attributable to noncontrolling interest	(267)	(196)	(320)
Consolidated net income attributable to Walmart	$ 13,673	$ 13,510	$ 14,881
Denominator
Weighted-average common shares outstanding, basic (in shares)	2,792	2,831	2,850
Dilutive impact of stock options and other share-based awards (in shares)	13	16	18
Weighted-average common shares outstanding, diluted (in shares)	2,805	2,847	2,868
Net income per common share attributable to Walmart
Basic (in USD per share)	$ 4.90	$ 4.77	$ 5.22
Diluted (in USD per share)	$ 4.87	$ 4.75	$ 5.19