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Benefit Plans
 9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Benefit Plans
Note I. Benefit Plans
The components of net periodic cost (benefit) are presented in the following table.
Net Periodic Cost (Benefit)
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2012
 
2011
 
2012
 
2011
Pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
9

 
$
10

Interest cost on projected benefit obligation
34

 
37

 
101

 
110

Expected return on plan assets
(43
)
 
(44
)
 
(128
)
 
(130
)
Amortization of net actuarial (gain) loss
10

 
7

 
29

 
19

Net periodic pension cost (benefit)
$
4

 
$
3

 
$
11

 
$
9

 
 
 
 
 
 
 
 
Postretirement cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
1

 
$
1

 
$
2

 
$
3

Amortization of prior service credit
(4
)
 
(5
)
 
(13
)
 
(14
)
Net periodic postretirement cost (benefit)
$
(3
)
 
$
(4
)
 
$
(11
)
 
$
(11
)