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POSTRETIREMENT BENEFIT PLANS - Schedule of Reconciliation of Benefit Obligation and Plan Assets (Details) - Qualified defined benefit pension plans - USD ($)
 3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Aug. 03, 2021
Sep. 26, 2021
Sep. 27, 2020
Dec. 31, 2020
Change in benefit obligation            
Beginning balance at December 31, 2020     $ 51,352,000,000 $ 51,352,000,000    
Service cost $ 26,000,000 $ 25,000,000   80,000,000 $ 76,000,000  
Interest cost 302,000,000 385,000,000   923,000,000 1,154,000,000  
Benefits paid       (1,611,000,000)    
Settlements       (4,885,000,000)    
Change in benefit obligation due to remeasurement       (1,253,000,000)    
Ending balance at September 26, 2021 44,606,000,000     44,606,000,000   $ 51,352,000,000
Change in plan assets            
Beginning balance at December 31, 2020     $ 38,481,000,000 38,481,000,000    
Expected return on plan assets(c) 517,000,000 566,000,000   1,655,000,000 1,698,000,000  
Expected return on plan assets recognized in remeasurement       1,618,000,000    
Benefits paid       (1,611,000,000)    
Settlements       (4,885,000,000)    
Company contributions 0 $ 0   0 $ 0  
Ending balance at September 26, 2021 35,258,000,000     35,258,000,000   $ 38,481,000,000
Unfunded status of the plans (9,348,000,000)     (9,348,000,000)    
Benefit obligation, discount rate     2.75%     2.50%
Long-term rate of return on plan assets     4.00%     7.00%
Actual return on plan assets     8.00%      
Net obligation 9,351,000,000     9,351,000,000    
Net asset $ 3,000,000     $ 3,000,000