Segments and Disaggregated Revenue (Operating Income by Segment, Interest and Other (Gains) and Losses) (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]
Operating income	$ 7,316	$ 6,854	$ 13,556	$ 12,172
Interest, net	494	448	1,051	867
Other (gains) and losses	(3,905)	(238)	(910)	1,760
Income before income taxes	10,727	6,644	13,415	9,545
Corporate and support
Segment Reporting Information [Line Items]
Operating income	(509)	(299)	(875)	(675)
Walmart U.S. | Operating Segments
Segment Reporting Information [Line Items]
Operating income	6,114	5,683	11,098	10,145
Walmart International | Operating Segments
Segment Reporting Information [Line Items]
Operating income	1,190	1,043	2,354	1,815
Sam's Club | Operating Segments
Segment Reporting Information [Line Items]
Operating income	$ 521	$ 427	$ 979	$ 887