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Benefit Plans
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Benefit Plans
Benefit Plans
The components of net periodic cost (benefit) are presented in the following table.
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2017
 
2016
 
2017
 
2016
Pension cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
25

 
$
29

 
$
77

 
$
85

Expected return on plan assets
(38
)
 
(41
)
 
(116
)
 
(121
)
Amortization of net actuarial loss
9

 
9

 
27

 
28

Settlement loss
6

 
—

 
8

 
—

Net periodic pension cost (benefit)
$
2

 
$
(3
)
 
$
(4
)
 
$
(8
)


The Company contributed $26 million to its pension plans for the nine months ended September 30, 2017 and expects to contribute an additional $2 million to its pension plans before December 31, 2017.