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POSTRETIREMENT PLANS (Tables)
 9 Months Ended
Sep. 24, 2017
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
 
Nine Months Ended
 
 
September 24,
2017
 
September 25,
2016
 
September 24,
2017
 
September 25,
2016
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
205

 
 
$
208

 
 
$
615

 
 
$
615

 
Interest cost
 
452

 
 
465

 
 
1,357

 
 
1,396

 
Expected return on plan assets
 
(602
)
 
 
(667
)
 
 
(1,806
)
 
 
(2,000
)
 
Recognized net actuarial losses
 
376

 
 
340

 
 
1,129

 
 
1,019

 
Amortization of prior service credits
 
(89
)
 
 
(90
)
 
 
(265
)
 
 
(272
)
 
Total net periodic benefit cost
 
$
342

 
 
$
256

 
 
$
1,030

 
 
$
758

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
5

 
 
$
6

 
 
$
15

 
 
$
18

 
Interest cost
 
25

 
 
30

 
 
76

 
 
89

 
Expected return on plan assets
 
(31
)
 
 
(34
)
 
 
(95
)
 
 
(103
)
 
Recognized net actuarial losses
 
4

 
 
8

 
 
14

 
 
25

 
Amortization of prior service costs
 
4

 
 
5

 
 
11

 
 
16

 
Total net periodic benefit cost
 
$
7

 
 
$
15

 
 
$
21

 
 
$
45