Segments and Disaggregated Revenue (Revenue from Contract with Customer Excluding Assessed Tax, International) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Revenue from External Customer [Line Items]
Net sales	$ 567,762	$ 555,233	$ 519,926
Walmart International [Member]
Revenue from External Customer [Line Items]
Net sales	100,959	121,360	120,130
Walmart International [Member] | E Commerce [Member]
Revenue from External Customer [Line Items]
Net sales	18,500	16,600	11,800
Mexico and Central America [Member] | Walmart International [Member]
Revenue from External Customer [Line Items]
Net sales	35,964	32,642	33,350
CANADA [Member] | Walmart International [Member]
Revenue from External Customer [Line Items]
Net sales	21,773	19,991	18,420
CHINA [Member] | Walmart International [Member]
Revenue from External Customer [Line Items]
Net sales	13,852	11,430	10,671
UNITED KINGDOM [Member] | Walmart International [Member]
Revenue from External Customer [Line Items]
Net sales	3,811	29,234	29,243
Other [Member] | Walmart International [Member]
Revenue from External Customer [Line Items]
Net sales	$ 25,559	$ 28,063	$ 28,446