Segments and Disaggregated Revenue (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Oct. 31, 2022 USD ($) segment	Oct. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment			3
Net sales	$ 151,469	$ 139,207	$ 443,138	$ 416,237
Walmart U.S.
Disaggregation of Revenue [Line Items]
Net sales	104,775	96,609	306,809	287,968
Walmart International
Disaggregation of Revenue [Line Items]
Net sales	25,295	23,627	73,408	73,962
Sam's Club
Disaggregation of Revenue [Line Items]
Net sales	21,399	18,971	62,921	54,307
eCommerce | Walmart U.S.
Disaggregation of Revenue [Line Items]
Net sales	12,900	11,100	36,900	33,600
eCommerce | Walmart International
Disaggregation of Revenue [Line Items]
Net sales	5,900	4,300	14,800	12,700
eCommerce | Sam's Club
Disaggregation of Revenue [Line Items]
Net sales	$ 2,100	$ 1,700	$ 6,000	$ 4,900