Segments and Disaggregated Revenue (Revenue, International) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Revenue from External Customer [Line Items]
Net sales	$ 160,280	$ 151,381	$ 311,284	$ 291,669
Walmart International
Revenue from External Customer [Line Items]
Net sales	27,596	24,350	54,200	48,113
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	11,994	9,690	22,952	18,778
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	5,842	5,767	10,982	10,917
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	3,896	3,397	8,820	7,524
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 5,864	$ 5,496	$ 11,446	$ 10,894