v3.25.1
Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, Sam's Club (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Revenue from External Customer [Line Items]    
Net sales $ 163,981 $ 159,938
Sam's Club U.S.    
Revenue from External Customer [Line Items]    
Net sales 22,064 21,435
Sam's Club U.S. | eCommerce    
Revenue from External Customer [Line Items]    
Net sales 3,300 2,600
Grocery | Sam's Club U.S.    
Revenue from External Customer [Line Items]    
Net sales 15,443 14,574
Fuel and other | Sam's Club U.S.    
Revenue from External Customer [Line Items]    
Net sales 2,851 3,334
General merchandise | Sam's Club U.S.    
Revenue from External Customer [Line Items]    
Net sales 2,536 2,477
Health and wellness | Sam's Club U.S.    
Revenue from External Customer [Line Items]    
Net sales $ 1,234 $ 1,050