Segments and Disaggregated Revenue (Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 151,469	$ 139,207	$ 443,138	$ 416,237
Walmart U.S.
Segment Reporting Information [Line Items]
Net sales	104,775	96,609	306,809	287,968
Walmart International
Segment Reporting Information [Line Items]
Net sales	25,295	23,627	73,408	73,962
Sam's Club
Segment Reporting Information [Line Items]
Net sales	$ 21,399	$ 18,971	$ 62,921	$ 54,307