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Benefit Plans
 3 Months Ended
Mar. 31, 2013
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)
2013
 
2012
Pension cost (benefit)
 
 
 
Service cost
$
3

 
$
3

Interest cost on projected benefit obligation
30

 
34

Expected return on plan assets
(45
)
 
(43
)
Amortization of net actuarial (gain) loss
12

 
10

Net periodic pension cost (benefit)
$
—

 
$
4

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