Segments and Disaggregated Revenue (Revenue, International) (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 International
Revenue from External Customer [Line Items]
Net sales	26,604	23,763
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	10,958	9,088
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	5,140	5,150
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	4,924	4,127
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 5,582	$ 5,398