Segments and Disaggregated Revenue (Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 159,938	$ 151,004
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	108,670	103,901
Walmart International
Segment Reporting Information [Line Items]
Net sales	29,833	26,604
Sam's Club
Segment Reporting Information [Line Items]
Net sales	$ 21,435	$ 20,499