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Benefit Plans
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Benefit Plans
Note H. Benefit Plans
The components of net periodic cost (benefit) are presented in the following table.
Net Periodic Cost (Benefit)
Three months ended March 31
 
 
 
(In millions)
2014
 
2013
Pension cost (benefit)
 
 
 
Service cost
$
3

 
$
3

Interest cost on projected benefit obligation
33

 
30

Expected return on plan assets
(48
)
 
(45
)
Amortization of net actuarial (gain) loss
6

 
12

Net periodic pension cost (benefit)
$
(6
)
 
$
—

 
 
 
 
Postretirement cost (benefit)
 
 
 
Amortization of prior service credit
$
(4
)
 
$
(4
)
Net periodic postretirement cost (benefit)
$
(4
)
 
$
(4
)