Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax Walmart U.S (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Revenue from External Customer [Line Items]
Net sales	$ 642,637	$ 605,881	$ 567,762
Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	441,817	420,553	393,247
Walmart U.S. | E Commerce
Revenue from External Customer [Line Items]
Net sales	65,400	53,400	47,800
Grocery | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	264,210	247,299	218,944
General merchandise | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	113,985	118,597	125,876
Health and wellness | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	54,898	46,591	42,839
Other categories | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	$ 8,724	$ 8,066	$ 5,588