Segments and Disaggregated Revenue (Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 160,280	$ 151,381	$ 311,284	$ 291,669
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	110,854	105,130	214,755	202,034
Walmart International
Segment Reporting Information [Line Items]
Net sales	27,596	24,350	54,200	48,113
Sam's Club
Segment Reporting Information [Line Items]
Net sales	$ 21,830	$ 21,901	$ 42,329	$ 41,522