Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Numerator
Consolidated net income	$ 2,103	$ 2,811
Consolidated net income attributable to noncontrolling interest	(49)	(81)
Consolidated net income attributable to Walmart	$ 2,054	$ 2,730
Denominator
Weighted-average common shares outstanding, basic (in shares)	2,754	2,815
Dilutive impact of share-based awards (in shares)	11	14
Weighted-average common shares outstanding, diluted (in shares)	2,765	2,829
Net income per common share attributable to Walmart
Basic (in dollars per share)	$ 0.75	$ 0.97
Diluted (in dollars per share)	$ 0.74	$ 0.97