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Benefit Plans
 6 Months Ended
Jun. 30, 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)
Periods ended June 30
Three Months
 
Six Months
(In millions)
2012
 
2011
 
2012
 
2011
Pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
6

 
$
7

Interest cost on projected benefit obligation
33

 
36

 
67

 
73

Expected return on plan assets
(42
)
 
(43
)
 
(85
)
 
(86
)
Amortization of net actuarial (gain) loss
9

 
6

 
19

 
12

Net periodic pension cost (benefit)
$
3

 
$
2

 
$
7

 
$
6

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

 
$
1

 
$
1

 
$
2

Amortization of prior service credit
(5
)
 
(4
)
 
(9
)
 
(9
)
Amortization of net actuarial (gain) loss
—

 
(1
)
 
—

 
—

Net periodic postretirement cost (benefit)
$
(4
)
 
$
(4
)
 
$
(8
)
 
$
(7
)