Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, International (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 International
Revenue from External Customer [Line Items]
Net sales	121,885	114,641	100,983
Walmart International | E Commerce
Revenue from External Customer [Line Items]
Net sales	29,500	24,800	20,300
Sam's Club U.S.
Revenue from External Customer [Line Items]
Net sales	90,238	86,179	84,345
Sam's Club U.S. | E Commerce
Revenue from External Customer [Line Items]
Net sales	12,100	9,900	8,400
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	51,970	49,726	40,496
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	23,035	22,639	22,300
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	19,975	17,011	14,711
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 26,905	$ 25,265	$ 23,476