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Retirement-Related Benefits (Narrative) (Details) - USD ($)
$ in Billions
12 Months Ended
Jan. 31, 2023
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%    
PUERTO RICO      
Contribution expense from retirement plans [Line Items]      
Defined contribution plan, requisite service period for eligibility (in years) 1 year    
Asda | Disposal Group, Held-for-sale, Not Discontinued Operations      
Contribution expense from retirement plans [Line Items]      
Accumulated pension components included in disposal group, expected amount   $ 2.3  
Pension Plan | Asda Group Pension Scheme      
Contribution expense from retirement plans [Line Items]      
Increase (decrease) in obligation, pension benefits     $ 1.0