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 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
Walmart U.S.        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 125,189 120,911 242,358 233,074
Walmart U.S. | eCommerce        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 29,400 23,700 56,400 45,100
Walmart U.S. | Grocery        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 74,130 71,092 144,826 138,923
Walmart U.S. | General merchandise        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales 29,728 29,458 56,148 54,734
Walmart 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 16,942 17,248 33,297 33,492
Walmart U.S. | Other categories        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Net sales $ 4,389 $ 3,113 $ 8,087 $ 5,925