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Employment Benefit Plans
9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Employment Benefit Plans
Employment Benefit Plans

Components of the net cost for the periods presented below for certain employee benefit plans were as follows (in millions):
 
 
Pension Benefits
 
 
Three Months Ended September 30,
Net Cost
 
2012
 
2011
Service cost
 
$
10

 
$
8

Interest cost
 
25

 
26

Expected return on plan assets
 
(30
)
 
(30
)
Amortization of net loss
 
3

 

Net cost recognized
 
$
8

 
$
4


 
 
Pension Benefits
 
 
Nine Months Ended September 30,
Net Cost
 
2012
 
2011
Service cost
 
$
29

 
$
24

Interest cost
 
75

 
77

Expected return on plan assets
 
(89
)
 
(90
)
Amortization of net loss
 
8

 

      Net cost recognized
 
$
23

 
$
11



 
 
Retiree Health and Welfare Benefits
 
 
Three Months Ended September 30,
Net Cost
 
2012
 
2011
Interest cost
 
$
4

 
$
4

Net cost recognized
 
$
4

 
$
4



 
 
Retiree Health and Welfare Benefits
 
 
Nine Months Ended September 30,
Net Cost
 
2012
 
2011
Service cost
 
$
1

 
$
1

Interest cost
 
10

 
11

Amortization of net loss
 
1

 

      Net cost recognized
 
$
12

 
$
12



    
The Company is not required to make contributions to the BNSF Retirement Plan in 2012; however, the Company made a discretionary contribution of $36 million in January 2012.