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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 29, 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 Ended
 
 
March 29,
2020
 
March 31,
2019
Qualified defined benefit pension plans
 
 
 
 
 
 
Service cost
 
$
25

 
 
$
129

 
Interest cost
 
385

 
 
452

 
Expected return on plan assets
 
(566
)
 
 
(575
)
 
Recognized net actuarial losses
 
212

 
 
351

 
Amortization of prior service credits
 
(86
)
 
 
(84
)
 
Total net periodic benefit (income) cost
 
$
(30
)
 
 
$
273

 
Retiree medical and life insurance plans
 
 
 
 
 
 
Service cost
 
$
3

 
 
$
4

 
Interest cost
 
18

 
 
24

 
Expected return on plan assets
 
(32
)
 
 
(28
)
 
Recognized net actuarial losses
 
(1
)
 
 
1

 
Amortization of prior service costs
 
10

 
 
10

 
Total net periodic benefit (income) cost
 
$
(2
)
 
 
$
11