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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic cost (benefit)
The components of net periodic cost (benefit) are presented in the following table.
Three months ended March 31
 
 
 
(In millions)
2017
 
2016
Pension cost (benefit)
 
 
 
Interest cost on projected benefit obligation
$
26

 
$
28

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

 
9

Settlement loss
2

 
—

Net periodic pension cost (benefit)
$
(2
)
 
$
(3
)