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Benefit Plans
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Benefit Plans
Note G. Benefit Plans
The components of net periodic cost (benefit) are presented in the following table.
Three months ended March 31
 
 
 
(In millions)
2016
 
2015
Pension cost (benefit)
 
 
 
Service cost
$
—

 
$
2

Interest cost on projected benefit obligation
28

 
28

Expected return on plan assets
(40
)
 
(43
)
Amortization of net actuarial loss
9

 
9

Net periodic pension cost (benefit)
$
(3
)
 
$
(4
)