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POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Pretax Net Periodic Benefit Cost
Our pretax net periodic benefit cost related to our qualified defined benefit pension plans and retiree medical and life insurance plans consisted of the following (in millions):
 
 
Quarters Ended
 
Six Months Ended
 
 
June 30,
2019
 
June 24,
2018
 
June 30,
2019
 
June 24,
2018
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
129

 
 
$
158

 
 
$
258

 
 
$
315

 
Interest cost
 
451

 
 
435

 
 
903

 
 
870

 
Expected return on plan assets
 
(575
)
 
 
(598
)
 
 
(1,150
)
 
 
(1,197
)
 
Recognized net actuarial losses
 
351

 
 
444

 
 
702

 
 
888

 
Amortization of prior service credits
 
(83
)
 
 
(82
)
 
 
(167
)
 
 
(163
)
 
Total net periodic benefit cost
 
$
273

 
 
$
357

 
 
$
546

 
 
$
713

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
3

 
 
$
4

 
 
$
7

 
 
$
9

 
Interest cost
 
24

 
 
23

 
 
48

 
 
46

 
Expected return on plan assets
 
(27
)
 
 
(33
)
 
 
(55
)
 
 
(67
)
 
Recognized net actuarial losses
 
—

 
 
1

 
 
1

 
 
2

 
Amortization of prior service costs
 
11

 
 
3

 
 
21

 
 
7

 
Total net periodic benefit cost (credit)
 
$
11

 
 
$
(2
)
 
 
$
22

 
 
$
(3
)