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POSTRETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 2019
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 30,
2019
 
June 24,
2018
 
June 30,
2019
 
June 24,
2018
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
129

 
 
$
158

 
 
$
258

 
 
$
315

 
Interest cost
 
451

 
 
435

 
 
903

 
 
870

 
Expected return on plan assets
 
(575
)
 
 
(598
)
 
 
(1,150
)
 
 
(1,197
)
 
Recognized net actuarial losses
 
351

 
 
444

 
 
702

 
 
888

 
Amortization of prior service credits
 
(83
)
 
 
(82
)
 
 
(167
)
 
 
(163
)
 
Total net periodic benefit cost
 
$
273

 
 
$
357

 
 
$
546

 
 
$
713

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
3

 
 
$
4

 
 
$
7

 
 
$
9

 
Interest cost
 
24

 
 
23

 
 
48

 
 
46

 
Expected return on plan assets
 
(27
)
 
 
(33
)
 
 
(55
)
 
 
(67
)
 
Recognized net actuarial losses
 
—

 
 
1

 
 
1

 
 
2

 
Amortization of prior service costs
 
11

 
 
3

 
 
21

 
 
7

 
Total net periodic benefit cost (credit)
 
$
11

 
 
$
(2
)
 
 
$
22

 
 
$
(3
)
 

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 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 or costs in the table above, along with similar costs related to our other postretirement benefit plans ($9 million and $20 million for the quarter and six months ended June 30, 2019 and $15 million and $29 million for the quarter and six months ended June 24, 2018) 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 $288 million ($227 million, net of tax) and $577 million ($454 million, net of tax) during the quarter and six months ended June 30, 2019 and $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 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), along with consideration of CAS and Internal Revenue Code rules. During the quarter and six months ended June 30, 2019, there were no contributions to our qualified defined benefit pension plans. 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.