Segments and Disaggregated Revenue (Revenue, International) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Revenue from External Customer [Line Items]
Net sales	$ 151,469	$ 139,207	$ 443,138	$ 416,237
Walmart International
Revenue from External Customer [Line Items]
Net sales	25,295	23,627	73,408	73,962
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	9,702	8,718	28,480	25,706
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	5,491	5,507	16,408	15,847
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	3,572	3,538	11,096	10,313
United Kingdom | Walmart International
Revenue from External Customer [Line Items]
Net sales	0	0	0	3,811
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 6,530	$ 5,864	$ 17,424	$ 18,285