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Pension and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Defined Benefit Pension and Other Postretirement Plans PENSION AND OTHER POSTRETIREMENT BENEFITS
The following summarizes the components of net periodic benefit costs:
 
Three Months Ended June 30, 2019
 
Pension Benefits
 
Other Benefits
(In millions)
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
60

 
$
35

 
$
8

 
$
8

Interest cost
27

 
18

 
10

 
8

Expected return on plan assets
(31
)
 
(24
)
 
—

 
—

Amortization – prior service credit
(12
)
 
(8
)
 
—

 
(1
)
                      – actuarial loss
7

 
8

 
(1
)
 
—

                      – settlement loss
2

 
1

 
—

 
—

Net periodic benefit cost
$
53

 
$
30

 
$
17

 
$
15


 
Six Months Ended June 30,
 
Pension Benefits
 
Other Benefits
(In millions)
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
118

 
$
71

 
$
16

 
$
15

Interest cost
55

 
36

 
19

 
15

Expected return on plan assets
(63
)
 
(50
)
 
—

 
—

Amortization – prior service credit
(23
)
 
(16
)
 
—

 
(2
)
                      – actuarial loss
11

 
17

 
(1
)
 
—

                      – settlement loss
2

 
2

 
—

 
—

Net periodic benefit cost
$
100

 
$
60

 
$
34

 
$
28


The components of net periodic benefit cost other than the service cost component are included in net interest and other financial costs on the consolidated statements of income.
During the six months ended June 30, 2019, we made a $16 million contribution to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $9 million and $23 million, respectively, during the six months ended June 30, 2019.