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, 2025	Jan. 31, 2024	Jan. 31, 2023
Numerator
Consolidated net income	$ 20,157	$ 16,270	$ 11,292
Consolidated net (income) loss attributable to noncontrolling interest	(721)	(759)	388
Consolidated net income attributable to Walmart	$ 19,436	$ 15,511	$ 11,680
Denominator
Weighted-average common shares outstanding, basic (in shares)	8,041	8,077	8,171
Dilutive impact of stock options and other share-based awards (in shares)	40	31	31
Weighted-average common shares outstanding, diluted (in shares)	8,081	8,108	8,202
Net income per common share attributable to Walmart
Basic (in USD per share)	$ 2.42	$ 1.92	$ 1.43
Diluted (in USD per share)	$ 2.41	$ 1.91	$ 1.42