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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
EMPLOYEE BENEFIT PLANS
9.
EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
 
Pension Plans
 
Other Postretirement
Benefit Plans
 
2020
 
2019
 
2020
 
2019
Three months ended March 31
 
 
 
 
 
 
 
Service cost
$
35

 
$
30

 
$
1

 
$
1

Interest cost
21

 
24

 
2

 
3

Expected return on plan assets
(44
)
 
(42
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
18

 
10

 
—

 
(1
)
Prior service credit
(5
)
 
(4
)
 
(1
)
 
(2
)
Special charges
—

 
—

 
—

 
1

Net periodic benefit cost 
$
25

 
$
18

 
$
2

 
$
2



The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net” in the statements of income.

During the three months ended March 31, 2020 and 2019, we contributed $12 million and $14 million, respectively, to our pension plans and $4 million to our other postretirement benefit plans during each period.

We previously disclosed in our annual report on Form 10-K for the year ended December 31, 2019 that we planned to contribute approximately $140 million to our pension plans and $21 million to our other postretirement benefit plans during 2020. Due to the current economic environment, we are reconsidering our intent to make a discretionary contribution of up to $100 million to our qualified U.S. pension plan.