Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2022	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Oct. 31, 2022	Oct. 31, 2021
Numerator
Consolidated net income (loss)	$ (1,767)	$ 5,147	$ 2,103	$ 3,132	$ 4,364	$ 2,811	$ 5,483	$ 10,307
Consolidated net income attributable to noncontrolling interest	(31)			(27)			(78)	(196)
Consolidated net income (loss) attributable to Walmart	$ (1,798)			$ 3,105			$ 5,405	$ 10,111
Denominator
Weighted-average common shares outstanding, basic (in shares)	2,711			2,785			2,733	2,799
Dilutive impact of share-based awards (in shares)	0			12			10	14
Weighted-average common shares outstanding, diluted (in shares)	2,711			2,797			2,743	2,813
Net income (loss) per common share attributable to Walmart
Basic (in dollars per share)	$ (0.66)			$ 1.11			$ 1.98	$ 3.61
Diluted (in dollars per share)	$ (0.66)			$ 1.11			$ 1.97	$ 3.59