Segments and Disaggregated Revenue (Revenue from Contract with Customer Excluding Assessed Tax, International) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Revenue from External Customer [Line Items]
Net sales	$ 605,881	$ 567,762	$ 555,233
Walmart International
Revenue from External Customer [Line Items]
Net sales	100,983	100,959	121,360
Walmart International | E Commerce
Revenue from External Customer [Line Items]
Net sales	20,300	18,500	16,600
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	40,496	35,964	32,642
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	22,300	21,773	19,991
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	14,711	13,852	11,430
United Kingdom | Walmart International
Revenue from External Customer [Line Items]
Net sales	0	3,811	29,234
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 23,476	$ 25,559	$ 28,063