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Benefit Plans
9 Months Ended
Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] 
Benefit Plans
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)
2011
 
2010
 
2011
 
2010
Pension cost
 
 
 
 
 
 
 
Service cost
$
3

 
$
5

 
$
10

 
$
13

Interest cost on projected benefit obligation
37

 
38

 
110

 
112

Expected return on plan assets
(44
)
 
(41
)
 
(130
)
 
(122
)
Amortization of net actuarial loss
7

 
6

 
19

 
18

Net periodic pension cost
$
3

 
$
8

 
$
9

 
$
21

 
 
 
 
 
 
 
 
Postretirement benefit
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
1

Interest cost on projected benefit obligation
1

 
2

 
3

 
6

Amortization of prior service credit
(5
)
 
(4
)
 
(14
)
 
(12
)
Amortization of net actuarial loss
—

 
—

 
—

 
1

Net periodic postretirement benefit
$
(4
)
 
$
(2
)
 
$
(11
)
 
$
(4
)