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Benefit Plans
 3 Months Ended
Mar. 31, 2012
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)
 
2012
 
2011
Pension cost
 
 
 
 
Service cost
 
$
3

 
$
4

Interest cost on projected benefit obligation
 
34

 
37

Expected return on plan assets
 
(43
)
 
(43
)
Amortization of net actuarial loss
 
10

 
6

Net periodic pension cost
 
$
4

 
$
4

 
 
 
 
 
Postretirement benefit
 
 
 
 
Interest cost on projected benefit obligation
 
$
—

 
$
1

Amortization of prior service credit
 
(4
)
 
(5
)
Amortization of net actuarial loss
 
—

 
1

Net periodic postretirement benefit
 
$
(4
)
 
$
(3
)