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POSTRETIREMENT BENEFIT PLANS
 9 Months Ended
Sep. 29, 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
 
Nine Months Ended
 
 
September 29,
2019
 
September 30,
2018
 
September 29,
2019
 
September 30,
2018
Qualified defined benefit pension plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
129

 
 
$
157

 
 
$
387

 
 
$
472

 
Interest cost
 
452

 
 
435

 
 
1,355

 
 
1,305

 
Expected return on plan assets
 
(575
)
 
 
(599
)
 
 
(1,725
)
 
 
(1,796
)
 
Recognized net actuarial losses
 
351

 
 
444

 
 
1,053

 
 
1,332

 
Amortization of prior service credits
 
(83
)
 
 
(81
)
 
 
(250
)
 
 
(244
)
 
Total net periodic benefit cost
 
$
274

 
 
$
356

 
 
$
820

 
 
$
1,069

 
Retiree medical and life insurance plans
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
4

 
 
$
4

 
 
$
11

 
 
$
13

 
Interest cost
 
25

 
 
23

 
 
73

 
 
69

 
Expected return on plan assets
 
(28
)
 
 
(34
)
 
 
(83
)
 
 
(101
)
 
Recognized net actuarial losses
 
1

 
 
2

 
 
2

 
 
4

 
Amortization of prior service costs
 
10

 
 
4

 
 
31

 
 
11

 
Total net periodic benefit cost (credit)
 
$
12

 
 
$
(1
)
 
 
$
34

 
 
$
(4
)
 

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 and $31 million for the quarter and nine months ended September 29, 2019 and $13 million and $42 million for the quarter and nine months ended September 30, 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 $290 million ($227 million, net of tax) and $867 million ($681 million, net of tax) during the quarter and nine months ended September 29, 2019 and $382 million ($300 million, net of tax) and $1.1 billion ($900 million, net of tax) during the quarter and nine months ended September 30, 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 nine months ended September 29, 2019, there were no contributions to our qualified defined benefit pension plans. During the quarter and nine months ended September 30, 2018, we contributed $1.5 billion and $5.0 billion to our qualified defined benefit pension plans.