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Retirement-Related Benefits (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Contribution expense from retirement plans [Line Items]      
Defined contribution plan, employer matching contribution, percent of match 100.00%    
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00%    
Vesting percentage of matching contribution to eligible associates 100.00%    
Defined contribution plan, maximum annual contributions per employee, percent 50.00%    
Asda pension contribution $ 0 $ 0 $ (1,036)
Asda [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]      
Contribution expense from retirement plans [Line Items]      
Accumulated pension components included in disposal group, expected amount   $ 2,300  
Pension Plan [Member] | Asda Group Pension Scheme [Member]      
Contribution expense from retirement plans [Line Items]      
Asda pension contribution     $ 1,000