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POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 29, 2024
Sep. 24, 2023
Sep. 29, 2024
Sep. 24, 2023
Qualified defined benefit pension plans        
Operating:        
Service cost $ (15) $ (17) $ (45) $ (49)
Non-operating:        
Interest cost (349) (364) (1,048) (1,094)
Expected return on plan assets 393 430 1,179 1,291
Amortization of actuarial losses (64) (42) (194) (126)
Amortization of prior service credits 36 87 110 261
Non-service FAS pension/retiree medical and life income 16 111 47 332
Total FAS pension income 1 94 2 283
Retiree medical and life insurance plans        
Operating:        
Service cost (2) (1) (4) (4)
Non-operating:        
Interest cost (15) (17) (47) (51)
Expected return on plan assets 27 25 81 77
Amortization of actuarial losses 8 7 26 23
Amortization of prior service credits (1) (2) (3) (7)
Non-service FAS pension/retiree medical and life income 19 13 57 42
Total FAS pension income $ 17 $ 12 $ 53 $ 38