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Segments and Disaggregated Revenue (Narrative) (Details) $ in Millions	3 Months Ended
	Apr. 30, 2023 USD ($) segment	Apr. 30, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment	3
Net sales	$ 151,004	$ 140,288
Walmart U.S.
Disaggregation of Revenue [Line Items]
Net sales	103,901	96,904
Walmart International
Disaggregation of Revenue [Line Items]
Net sales	26,604	23,763
Sam's Club
Disaggregation of Revenue [Line Items]
Net sales	20,499	19,621
eCommerce | Walmart U.S.
Disaggregation of Revenue [Line Items]
Net sales	14,500	11,400
eCommerce | Walmart International
Disaggregation of Revenue [Line Items]
Net sales	5,400	4,300
eCommerce | Sam's Club
Disaggregation of Revenue [Line Items]
Net sales	$ 2,200	$ 1,900

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