Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax Walmart U.S (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Revenue from External Customer [Line Items]
Net sales	$ 674,538	$ 642,637	$ 605,881
Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	462,415	441,817	420,553
Walmart U.S. | E Commerce
Revenue from External Customer [Line Items]
Net sales	79,300	65,400	53,400
Grocery | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	276,003	264,210	247,299
General merchandise | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	113,921	113,985	118,597
Health and wellness | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	62,092	54,898	46,591
Other | Walmart U.S.
Revenue from External Customer [Line Items]
Net sales	$ 10,399	$ 8,724	$ 8,066