Segments and Disaggregated Revenue (Revenue from Contract with Customer Excluding Assessed Tax Walmart U.S) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Revenue from External Customer [Line Items]
Net sales	$ 605,881	$ 567,762	$ 555,233
Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	420,553	393,247	369,963
Walmart U.S. | E Commerce
Revenue from External Customer [Line Items]
Net sales	53,400	47,800	43,000
Grocery | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	247,299	218,944	208,413
General merchandise | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	118,597	125,876	119,406
Health and wellness | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	46,591	42,839	38,522
Other categories | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	$ 8,066	$ 5,588	$ 3,622