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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 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
 
 
 
March 31,
2019
 
March 25,
2018
 
Qualified defined benefit pension plans
 
 
 
 
 
 
 
Service cost
 
$
129

 
 
$
157

 
 
Interest cost
 
452

 
 
435

 
 
Expected return on plan assets
 
(575
)
 
 
(599
)
 
 
Recognized net actuarial losses
 
351

 
 
444

 
 
Amortization of prior service credits
 
(84
)
 
 
(81
)
 
 
Total net periodic benefit cost
 
$
273

 
 
$
356

 
 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
Service cost
 
$
4

 
 
$
5

 
 
Interest cost
 
24

 
 
23

 
 
Expected return on plan assets
 
(28
)
 
 
(34
)
 
 
Recognized net actuarial losses
 
1

 
 
1

 
 
Amortization of prior service costs
 
10

 
 
4

 
 
Total net periodic benefit (credit) cost
 
$
11

 
 
$
(1
)