Segments and Disaggregated Revenue (Revenue, Walmart US) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Revenue from External Customer [Line Items]
Net sales	$ 159,938	$ 151,004
Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	108,670	103,901
Walmart U.S. | Grocery
Revenue from External Customer [Line Items]
Net sales	66,431	63,407
Walmart U.S. | General merchandise
Revenue from External Customer [Line Items]
Net sales	25,711	25,765
Walmart U.S. | Health and wellness
Revenue from External Customer [Line Items]
Net sales	14,249	12,848
Walmart U.S. | Other categories
Revenue from External Customer [Line Items]
Net sales	$ 2,279	$ 1,881