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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic cost (benefit)
The components of net periodic pension cost (benefit) are presented in the following table.
Periods ended June 30
Three Months
 
Six Months
(In millions)
2018
 
2017
 
2018
 
2017
Net periodic pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Non-service cost:
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
24

 
26

 
47

 
52

Expected return on plan assets
(40
)
 
(39
)
 
(80
)
 
(78
)
Amortization of net actuarial loss
9

 
9

 
18

 
18

Settlement loss
1

 
—

 
5

 
2

Total non-service cost
(6
)
 
(4
)
 
(10
)
 
(6
)
Total net periodic pension cost (benefit)
$
(6
)
 
$
(4
)
 
$
(10
)
 
$
(6
)