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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] 
Net Periodic Benefit Costs
The following table summarizes the net periodic benefit costs of our pension plans for the periods presented (in millions):
 
 
Third Quarter
 
First Nine Months
 
2011
 
2010
 
2011
 
2010
Components of net periodic benefit costs:
 
 
 
 
 
Service cost
$
13

 
$
10

 
$
37

 
$
31

Interest cost
14

 
13

 
42

 
37

Expected return on plan assets
(19
)
 
(16
)
 
(56
)
 
(47
)
Amortization of net prior service cost
—

 
—

 
1

 
1

Amortization of actuarial loss
2

 
2

 
6

 
6

Net periodic benefit cost
10

 
9

 
30

 
28

Other
—

 
—

 
3

 
—

Total costs
$
10

 
$
9

 
$
33

 
$
28

Contributions Made to Pension Plans Summary
The following table summarizes our projected contributions for the full year ending December 31, 2011, as well as actual contributions for the year ended December 31, 2010 (in millions):
 
 
Projected(A)
2011
 
Actual(A)
2010
Total pension contributions
$
58

 
$
116

 ___________________________
(A) 
These amounts represent only company-paid contributions.