Segments and Disaggregated Revenue (Revenue, Walmart US) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Revenue from External Customer [Line Items]
Net sales	$ 151,004	$ 140,288
Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	103,901	96,904
Walmart U.S. | Grocery
Revenue from External Customer [Line Items]
Net sales	63,407	56,764
Walmart U.S. | General merchandise
Revenue from External Customer [Line Items]
Net sales	25,765	27,379
Walmart U.S. | Health and wellness
Revenue from External Customer [Line Items]
Net sales	12,848	10,894
Walmart U.S. | Other categories
Revenue from External Customer [Line Items]
Net sales	$ 1,881	$ 1,867