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Defined Benefit Pension and Other Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [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)
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
31

 
$
28

 
$
7

 
$
8

Interest cost
19

 
19

 
8

 
9

Expected return on plan assets
(26
)
 
(25
)
 
—

 
—

Amortization – prior service credit
(10
)
 
(11
)
 
(1
)
 
(1
)
                      – actuarial loss
9

 
10

 
—

 
1

                      – settlement loss
—

 
1

 
—

 
—

Net periodic benefit cost
$
23

 
$
22

 
$
14

 
$
17