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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
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