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Defined Benefit Postretirement Plans
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Defined Benefit Postretirement Plans Defined Benefit Postretirement Plans
The following summarizes the components of net periodic benefit cost:
 
Three Months Ended March 31,
 
Pension Benefits
 
Other Benefits
(In millions)
2020
 
2019(c)
 
2020
 
2019
Service cost
$
5

 
$
4

 
$
—

 
$
—

Interest cost
3

 
7

 
1

 
1

Expected return on plan assets
(3
)
 
(8
)
 
—

 
—

Amortization:
 

 
 

 
 

 
 

– prior service cost (credit)
(2
)
 
(2
)
 
(4
)
 
(4
)
– actuarial loss
3

 
2

 
—

 
—

Net settlement loss(a)
2

 
—

 
—

 
—

Net periodic benefit cost(b)
$
8

 
$
3

 
$
(3
)
 
$
(3
)

(a) 
Settlements are recognized as they occur, once it is probable that lump sum payments from a plan for a given year will exceed the plan’s total service and interest cost for that year.
(b) 
Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.
(c) 
Includes amounts related to the noncontributory defined benefit pension plan covering U.K. employees, prior to the plan being transferred to the buyer upon sale of the U.K. asset on July 1, 2019.

During the first three months of 2020, we made contributions of $6 million to our funded pension plan and expect to contribute an additional $22 million this year. During the first three months of 2020, we made payments of $5 million and $4 million related to unfunded pension plans and other postretirement benefit plans.