Segments and Disaggregated Revenue (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Jul. 31, 2023 USD ($) segment	Jul. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment			3
Net sales	$ 160,280	$ 151,381	$ 311,284	$ 291,669
Walmart U.S.
Disaggregation of Revenue [Line Items]
Net sales	110,854	105,130	214,755	202,034
Walmart International
Disaggregation of Revenue [Line Items]
Net sales	27,596	24,350	54,200	48,113
Sam's Club
Disaggregation of Revenue [Line Items]
Net sales	21,830	21,901	42,329	41,522
eCommerce | Walmart U.S.
Disaggregation of Revenue [Line Items]
Net sales	15,500	12,500	30,000	23,900
eCommerce | Walmart International
Disaggregation of Revenue [Line Items]
Net sales	5,800	4,600	11,200	8,900
eCommerce | Sam's Club
Disaggregation of Revenue [Line Items]
Net sales	$ 2,400	$ 2,100	$ 4,700	$ 3,900