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Benefit Plans
 3 Months Ended
Mar. 31, 2015
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)
2015
 
2014
Pension cost (benefit)
 
 
 
Service cost
$
2

 
$
3

Interest cost on projected benefit obligation
28

 
33

Expected return on plan assets
(43
)
 
(48
)
Amortization of net actuarial loss
9

 
6

Net periodic pension cost (benefit)
$
(4
)
 
$
(6
)
 
 
 
 
Postretirement cost (benefit)
 
 
 
Amortization of prior service credit
$
—

 
$
(4
)
Net periodic postretirement cost (benefit)
$
—

 
$
(4
)