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Defined Benefit Pension and Other Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The following summarizes the components of net periodic benefit costs:
 
Three Months Ended March 31,
 
Pension Benefits
 
Other Benefits
(In millions)
2018
 
2017
 
2018
 
2017
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
36

 
$
31

 
$
7

 
$
7

Interest cost
18

 
19

 
7

 
8

Expected return on plan assets
(26
)
 
(26
)
 
—

 
—

Amortization – prior service credit
(8
)
 
(10
)
 
(1
)
 
(1
)
                      – actuarial loss
9

 
9

 
—

 
—

                      – settlement loss
1

 
—

 
—

 
—

Net periodic benefit cost
$
30

 
$
23

 
$
13

 
$
14