v3.26.1
Segments and Disaggregated Revenue - Revenue from Contract with Customer Excluding Assessed Tax, Sam's Club (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales $ 186,100 $ 175,750 $ 361,784 $ 339,731
Sam's Club U.S.        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 25,713 23,638 49,118 45,702
Sam's Club U.S. | eCommerce        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 4,700 3,700 8,800 7,100
Sam's Club U.S. | Grocery        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 17,223 16,417 33,325 31,860
Sam's Club U.S. | Fuel and other        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 4,192 3,064 7,635 5,915
Sam's Club U.S. | General merchandise        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 3,042 2,877 5,691 5,413
Sam's Club U.S. | Health and wellness        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales $ 1,256 $ 1,280 $ 2,467 $ 2,514