Segments and Disaggregated Revenue (Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Segment Reporting Information [Line Items]
Net sales	$ 151,004	$ 140,288
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	103,901	96,904
Walmart International
Segment Reporting Information [Line Items]
Net sales	26,604	23,763
Sam's Club
Segment Reporting Information [Line Items]
Net sales	$ 20,499	$ 19,621