Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, International (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 International
Revenue from External Customer [Line Items]
Net sales	114,641	100,983	100,959
Walmart International | E Commerce
Revenue from External Customer [Line Items]
Net sales	24,800	20,300	18,500
Mexico and Central America | Walmart International
Revenue from External Customer [Line Items]
Net sales	49,726	40,496	35,964
Canada | Walmart International
Revenue from External Customer [Line Items]
Net sales	22,639	22,300	21,773
China | Walmart International
Revenue from External Customer [Line Items]
Net sales	17,011	14,711	13,852
United Kingdom | Walmart International
Revenue from External Customer [Line Items]
Net sales	0	0	3,811
Other | Walmart International
Revenue from External Customer [Line Items]
Net sales	$ 25,265	$ 23,476	$ 25,559