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, 2023	Jan. 31, 2022	Jan. 31, 2021
Numerator
Consolidated net income	$ 11,292	$ 13,940	$ 13,706
Consolidated net (income) loss attributable to noncontrolling interest	388	(267)	(196)
Consolidated net income attributable to Walmart	$ 11,680	$ 13,673	$ 13,510
Denominator
Weighted-average common shares outstanding, basic (in shares)	2,724	2,792	2,831
Dilutive impact of stock options and other share-based awards (in shares)	10	13	16
Weighted-average common shares outstanding, diluted (in shares)	2,734	2,805	2,847
Net income per common share attributable to Walmart
Basic (in USD per share)	$ 4.29	$ 4.90	$ 4.77
Diluted (in USD per share)	$ 4.27	$ 4.87	$ 4.75