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POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 25, 2023
Jun. 30, 2024
Jun. 25, 2023
Qualified defined benefit pension plans        
Operating:        
Service cost $ (15) $ (16) $ (30) $ (32)
Non-operating:        
Interest cost (350) (365) (699) (730)
Expected return on plan assets 393 431 786 861
Amortization of actuarial losses (65) (42) (130) (84)
Amortization of prior service credits 37 87 74 174
Non-service FAS pension/retiree medical and life income 15 111 31 221
Total FAS pension income 0 95 1 189
Retiree medical and life insurance plans        
Operating:        
Service cost (1) (2) (2) (3)
Non-operating:        
Interest cost (16) (17) (32) (34)
Expected return on plan assets 27 26 54 52
Amortization of actuarial losses 9 8 18 16
Amortization of prior service credits (1) (2) (2) (5)
Non-service FAS pension/retiree medical and life income 19 15 38 29
Total FAS pension income $ 18 $ 13 $ 36 $ 26