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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. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Qualified defined benefit pension plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 27 $ 26 $ 54 $ 51
Interest cost 310 384 621 769
Expected return on plan assets (569) (566) (1,138) (1,132)
Recognized net actuarial losses 252 212 504 424
Amortization of prior service credits (87) (85) (174) (171)
Total net periodic benefit income (67) (29) (133) (59)
Retiree medical and life insurance plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 4 4 7 7
Interest cost 13 17 26 35
Expected return on plan assets (35) (32) (70) (64)
Recognized net actuarial losses 0 (1) 0 (2)
Amortization of prior service credits 9 9 18 19
Total net periodic benefit income $ (9) $ (3) $ (19) $ (5)