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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Pension and Other Postretirement Plans PENSION AND OTHER POSTRETIREMENT BENEFITS
The following summarizes the components of net periodic benefit costs:
 
Three Months Ended September 30, 2019
 
Pension Benefits
 
Other Benefits
(In millions)
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
57

 
$
36

 
$
8

 
$
7

Interest cost
27

 
18

 
9

 
7

Expected return on plan assets
(31
)
 
(25
)
 
—

 
—

Amortization – prior service credit
(11
)
 
(9
)
 
—

 
—

                      – actuarial loss
5

 
9

 
—

 
(1
)
                      – settlement loss
7

 
45

 
—

 
—

Net periodic benefit cost
$
54

 
$
74

 
$
17

 
$
13


 
Nine Months Ended September 30,
 
Pension Benefits
 
Other Benefits
(In millions)
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
175

 
$
107

 
$
24

 
$
22

Interest cost
82

 
54

 
28

 
22

Expected return on plan assets
(94
)
 
(75
)
 
—

 
—

Amortization – prior service credit
(34
)
 
(25
)
 
—

 
(2
)
                      – actuarial loss
16

 
26

 
(1
)
 
(1
)
                      – settlement loss
9

 
47

 
—

 
—

Net periodic benefit cost
$
154

 
$
134

 
$
51

 
$
41


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 nine months ended September 30, 2019, we made contributions of $267 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $16 million and $32 million, respectively, during the nine months ended September 30, 2019.