v3.26.1
Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax Walmart U.S (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Revenue from External Customer [Line Items]    
Net sales $ 175,684 $ 163,981
Walmart U.S.    
Revenue from External Customer [Line Items]    
Net sales 117,169 112,163
Walmart U.S. | eCommerce    
Revenue from External Customer [Line Items]    
Net sales 27,100 21,400
Grocery | Walmart U.S.    
Revenue from External Customer [Line Items]    
Net sales 70,696 67,831
General merchandise | Walmart U.S.    
Revenue from External Customer [Line Items]    
Net sales 26,420 25,276
Health and wellness | Walmart U.S.    
Revenue from External Customer [Line Items]    
Net sales 16,355 16,244
Other categories | Walmart U.S.    
Revenue from External Customer [Line Items]    
Net sales $ 3,698 $ 2,812