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, 2024	Jan. 31, 2023	Jan. 31, 2022
Numerator
Consolidated net income	$ 16,270	$ 11,292	$ 13,940
Consolidated net (income) loss attributable to noncontrolling interest	(759)	388	(267)
Consolidated net income attributable to Walmart	$ 15,511	$ 11,680	$ 13,673
Denominator
Weighted-average common shares outstanding, basic (in shares)	8,077	8,171	8,376
Dilutive impact of stock options and other share-based awards (in shares)	31	31	39
Weighted-average common shares outstanding, diluted (in shares)	8,108	8,202	8,415
Net income per common share attributable to Walmart
Basic (in USD per share)	$ 1.92	$ 1.43	$ 1.63
Diluted (in USD per share)	$ 1.91	$ 1.42	$ 1.62