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Benefit Plans
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Benefit Plans
Benefit Plans
The components of net periodic cost (benefit) are presented in the following table.
Periods ended June 30
Three Months
 
Six Months
(In millions)
2017
 
2016
 
2017
 
2016
Pension cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
26

 
$
28

 
$
52

 
$
56

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

 
10

 
18

 
19

Settlement loss
—

 
—

 
2

 
—

Net periodic pension cost (benefit)
$
(4
)
 
$
(2
)
 
$
(6
)
 
$
(5
)