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POSTRETIREMENT BENEFIT PLANS
 3 Months Ended
Mar. 31, 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
 
 
 
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
)
 
 

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 ($11 million for the quarter ended March 31, 2019 and $14 million for the quarter ended March 25, 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 $289 million ($227 million, net of tax) during the quarter ended March 31, 2019 and $382 million ($300 million, net of tax) during the quarter ended March 25, 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 ended March 31, 2019, there were no contributions to our qualified defined benefit pension plans. During the quarter ended March 25, 2018, we contributed $1.5 billion to our qualified defined benefit pension plans.