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BENEFIT PLANS - Defined Benefit Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Aug. 03, 2019
Changes in Plan Assets      
Fair value of plan assets at beginning of year $ 1,991    
Fair value of plan assets at end of year $ 2,118 $ 1,991  
SUPERVALU INC. Retirement Plan      
Changes in Plan Assets      
Change in discount rate (as a percent) 0.35% 1.13%  
Pension Benefits      
Changes in Benefit Obligation      
Benefit Obligation at beginning of year $ 2,260 $ 2,709  
Actuarial (gain) loss (103) 277  
Benefits paid (101) (94)  
Interest cost 37 57 $ 76
Settlements paid 0 (689)  
Plan amendment 0 0  
Benefit obligation at end of year 2,093 2,260 2,709
Changes in Plan Assets      
Fair value of plan assets at beginning of year 1,991 2,497  
Actual return on plan assets 226 262  
Benefits paid (101) (94)  
Settlements paid 0 (690)  
Employer contributions 2 16  
Fair value of plan assets at end of year 2,118 1,991 2,497
Funded (unfunded) status at end of year 25 (269)  
Pension Benefits | SUPERVALU INC. Retirement Plan      
Changes in Benefit Obligation      
Benefit Obligation at beginning of year 1,939    
Benefit obligation at end of year 1,796 1,939  
Changes in Plan Assets      
Fair value of plan assets at beginning of year 1,761    
Fair value of plan assets at end of year 1,860 1,761  
Funded (unfunded) status at end of year 64 (178)  
Pension Benefits | Unified Grocers, Inc. Cash Balance Plan and Other      
Changes in Benefit Obligation      
Benefit Obligation at beginning of year 321    
Benefit obligation at end of year 297 321  
Changes in Plan Assets      
Fair value of plan assets at beginning of year 230    
Fair value of plan assets at end of year 258 230  
Funded (unfunded) status at end of year (39) (91)  
Other Postretirement Benefits      
Changes in Benefit Obligation      
Benefit Obligation at beginning of year 37 38  
Actuarial (gain) loss (9) 1  
Benefits paid (3) (3)  
Interest cost 0 1 1
Settlements paid (18) 0  
Plan amendment 11 0  
Benefit obligation at end of year 18 37 38
Changes in Plan Assets      
Fair value of plan assets at beginning of year 12 11  
Actual return on plan assets 0 1  
Benefits paid (3) (3)  
Settlements paid (18) 0  
Employer contributions 9 3  
Fair value of plan assets at end of year 0 12 $ 11
Funded (unfunded) status at end of year $ (18) $ (25)