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Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30
Three Months
 
Nine Months
(In millions)
2018
 
2017
 
2018
 
2017
Net periodic pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Non-service cost (benefit):
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
23

 
25

 
70

 
77

Expected return on plan assets
(40
)
 
(38
)
 
(120
)
 
(116
)
Amortization of net actuarial loss
10

 
9

 
28

 
27

Settlement loss
—

 
6

 
5

 
8

Total non-service cost (benefit)
(7
)
 
2

 
(17
)
 
(4
)
Total net periodic pension cost (benefit)
$
(7
)
 
$
2

 
$
(17
)
 
$
(4
)