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POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 28, 2020
Retirement Benefits [Abstract]  
Schedule of Pretax Net Periodic Benefit Cost
Our pretax net periodic benefit (income) cost related to our qualified defined benefit pension plans and retiree medical and life insurance plans consisted of the following (in millions):
 Quarters EndedSix Months Ended
 June 28,
2020		June 30,
2019		June 28,
2020		June 30,
2019
Qualified defined benefit pension plans
Service cost$26  $129  $51  $258  
Interest cost 384  451  769  903  
Expected return on plan assets (566) (575) (1132) (1,150) 
Recognized net actuarial losses 212  351  424  702  
Amortization of prior service credits (85) (83) (171) (167) 
Total net periodic benefit (income) cost$(29) $273  $(59) $546  
Retiree medical and life insurance plans
Service cost$4  $3  $7  $7  
Interest cost 17  24  35  48  
Expected return on plan assets (32) (27) (64) (55) 
Recognized net actuarial losses (1) —  (2) 1  
Amortization of prior service costs 9  11  19  21  
Total net periodic benefit (income) cost$(3) $11  $(5) $22