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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 25, 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
 
 
March 25,
2018
 
March 26,
2017
Qualified defined benefit pension plans
 
 
 
 
 
 
Service cost
 
$
157

 
 
$
159

 
Interest cost
 
435

 
 
458

 
Expected return on plan assets
 
(599
)
 
 
(562
)
 
Recognized net actuarial losses
 
444

 
 
376

 
Amortization of prior service credits
 
(81
)
 
 
(86
)
 
Total net periodic benefit cost
 
$
356

 
 
$
345

 
Retiree medical and life insurance plans
 
 
 
 
 
 
Service cost
 
$
5

 
 
$
5

 
Interest cost
 
23

 
 
26

 
Expected return on plan assets
 
(34
)
 
 
(32
)
 
Recognized net actuarial losses
 
1

 
 
5

 
Amortization of prior service costs
 
4

 
 
3

 
Total net periodic benefit (credit) cost
 
$
(1
)
 
 
$
7