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Disposals, Acquisitions and Related Items (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Mar. 31, 2021
Feb. 28, 2021
Business Acquisition [Line Items]          
Losses on disposal of business operations $ 433.0 $ 8,401.0 $ 15.0    
Seiyu [Member]          
Business Acquisition [Line Items]          
Ownership interest in investment 15.00%        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Asda [Member]          
Business Acquisition [Line Items]          
Disposal group, consideration         $ 9,600.0
Losses on disposal of business operations $ 200.0        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Seiyu [Member]          
Business Acquisition [Line Items]          
Losses on disposal of business operations $ 200.0        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Walmart Argentina [Member]          
Business Acquisition [Line Items]          
Losses on disposal of business operations   1,000.0      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Asda [Member]          
Business Acquisition [Line Items]          
Losses on disposal of business operations   5,500.0      
Accumulated pension components included in disposal group, expected amount   2,300.0      
Reduction to fair value of disposal group   800.0      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Seiyu [Member]          
Business Acquisition [Line Items]          
Disposal group, consideration       $ 1,200.0  
Losses on disposal of business operations   $ 1,900.0