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POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 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
 
Nine Months Ended
 
 
September 30,
2018
 
September 24,
2017
 
September 30,
2018
 
September 24,
2017
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
157

 
 
$
159

 
 
$
472

 
 
$
476

 
Interest cost
 
435

 
 
459

 
 
1,305

 
 
1,377

 
Expected return on plan assets
 
(599
)
 
 
(563
)
 
 
(1,796
)
 
 
(1,687
)
 
Recognized net actuarial losses
 
444

 
 
376

 
 
1,332

 
 
1,129

 
Amortization of prior service credits
 
(81
)
 
 
(89
)
 
 
(244
)
 
 
(265
)
 
Total net periodic benefit cost
 
$
356

 
 
$
342

 
 
$
1,069

 
 
$
1,030

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
4

 
 
$
4

 
 
$
13

 
 
$
14

 
Interest cost
 
23

 
 
26

 
 
69

 
 
77

 
Expected return on plan assets
 
(34
)
 
 
(31
)
 
 
(101
)
 
 
(95
)
 
Recognized net actuarial losses
 
2

 
 
4

 
 
4

 
 
14

 
Amortization of prior service costs
 
4

 
 
4

 
 
11

 
 
11

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

 
 
$
(4
)
 
 
$
21