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POSTRETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 24, 2018
Retirement Benefits [Abstract]  
POSTRETIREMENT BENEFIT PLANS
POSTRETIREMENT BENEFIT PLANS
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

 

We record the service cost component of net periodic benefit cost as part of cost of sales and the non-service cost components of net periodic benefit cost (i.e., interest cost, expected return on plan assets, net actuarial gains or losses, and amortization of prior service cost or credits) as part of other non-operating expense, net in the consolidated statements of earnings.
The recognized net actuarial losses and amortization of prior service (credits) costs in the table above, along with similar amounts related to our other postretirement benefit plans ($15 million and $29 million for the quarter and six months ended June 24, 2018 and $13 million and $27 million for the quarter and six months ended June 25, 2017), were reclassified from accumulated other comprehensive loss (AOCL) and recorded as a component of net periodic benefit cost for the periods presented. These costs totaled $381 million ($300 million, net of tax) and $763 million ($600 million, net of tax) during the quarter and six months ended June 24, 2018 and $309 million ($200 million, net of tax) and $621 million ($402 million, net of tax) during the quarter and six months ended June 25, 2017, which were recorded on our consolidated statements of comprehensive income as an increase to other comprehensive income.
The funding of our qualified defined benefit pension plans is determined in accordance with the Employee Retirement Income Security Act of 1974 (ERISA), as amended by the Pension Protection Act of 2006 (PPA), and in a manner consistent with CAS and Internal Revenue Code rules. During the quarter and six months ended June 24, 2018, we contributed $2.0 billion and $3.5 billion to our qualified defined benefit pension plans. There were no material contributions to our qualified defined benefit pension plans during the quarter and six months ended June 25, 2017. We will make additional contributions of $1.5 billion to our qualified defined benefit pension plans on or before September 15, 2018.