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Disposals, Acquisitions and Related Items (Narrative) (Details)
R$ in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 18, 2018
USD ($)
Aug. 31, 2018
Jan. 31, 2021
USD ($)
Oct. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Mar. 19, 2021
Nov. 30, 2020
USD ($)
Oct. 31, 2018
USD ($)
Aug. 01, 2018
USD ($)
Aug. 01, 2018
BRL (R$)
Business Acquisition [Line Items]                        
Losses on disposal of business operations         $ 8,401,000,000 $ 15,000,000 $ 4,850,000,000          
Goodwill     $ 28,983,000,000   28,983,000,000 $ 31,073,000,000 31,181,000,000          
Finite-lived intangible asset, useful life 3 years                      
Flipkart [Member]                        
Business Acquisition [Line Items]                        
Percentage of outstanding shares acquired 81.00%                      
Diluted ownership, percent 77.00%                      
Payments to acquire businesses $ 16,000,000,000                      
Total assets held for sale 24,100,000,000                      
Cash and cash equivalents 2,200,000,000                      
Other current assets 2,800,000,000                      
Intangible assets other than goodwill 5,000,000,000.0                      
Goodwill 13,500,000,000                      
Indefinite-lived intangible assets 4,700,000,000                      
Finite-lived intangibles 300,000,000                      
Total liabilities held for sale 3,700,000,000                      
Current liabilities 1,800,000,000                      
Deferred income taxes and other 1,700,000,000                      
Noncontrolling interest $ 4,300,000,000                      
Walmart Argentina [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Losses on disposal of business operations       $ 1,000,000,000.0                
Asda [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Losses on disposal of business operations     5,500,000,000                  
Disposal Group, Consideration       $ 9,400,000,000                
Reduction to fair value of disposal group     800,000,000   800,000,000              
Accumulated pension components included in disposal group, expected amount         $ 2,300,000,000              
Seiyu [Member] | Subsequent Event [Member]                        
Business Acquisition [Line Items]                        
Ownership interest in investment               15.00%        
Seiyu [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Losses on disposal of business operations     $ 1,900,000,000                  
Disposal Group, Consideration                 $ 1,200,000,000      
Walmart Brazil [Member]                        
Business Acquisition [Line Items]                        
Guarantor obligations, maximum exposure | R$                       R$ 2.3
Equity method investment, ownership percentage                   20.00%    
Equity method investments fair value disclosure                   $ 0    
Equity method investments                   $ 0    
Walmart Brazil [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Losses on disposal of business operations             $ 4,800,000,000          
Ownership sold, percent   80.00%                    
Additional contributed capital, period   3 years                    
Guarantor obligations, current carrying value                     $ 800,000,000