Segments and Disaggregated Revenue (Revenue, International) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Revenue from External Customer [Line Items]
Net sales	$ 140,288	$ 137,159
Walmart International
Revenue from External Customer [Line Items]
Net sales	23,763	27,300
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	9,088	8,330
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	5,150	4,848
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	4,127	3,773
United Kingdom | Walmart International
Revenue from External Customer [Line Items]
Net sales	0	3,811
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 5,398	$ 6,538