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POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 24, 2018
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 24,
2018
 
June 25,
2017
 
June 24,
2018
 
June 25,
2017
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
158

 
 
$
158

 
 
$
315

 
 
$
317

 
Interest cost
 
435

 
 
460

 
 
870

 
 
918

 
Expected return on plan assets
 
(598
)
 
 
(562
)
 
 
(1,197
)
 
 
(1,124
)
 
Recognized net actuarial losses
 
444

 
 
377

 
 
888

 
 
753

 
Amortization of prior service credits
 
(82
)
 
 
(90
)
 
 
(163
)
 
 
(176
)
 
Total net periodic benefit cost
 
$
357

 
 
$
343

 
 
$
713

 
 
$
688

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
4

 
 
$
5

 
 
$
9

 
 
$
10

 
Interest cost
 
23

 
 
25

 
 
46

 
 
51

 
Expected return on plan assets
 
(33
)
 
 
(32
)
 
 
(67
)
 
 
(64
)
 
Recognized net actuarial losses
 
1

 
 
5

 
 
2

 
 
10

 
Amortization of prior service costs
 
3

 
 
4

 
 
7

 
 
7

 
Total net periodic benefit (credit) cost
 
$
(2
)
 
 
$
7

 
 
$
(3
)
 
 
$
14