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Retirement Benefits (Unaudited)
3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefits
RETIREMENT BENEFITS
The cost to the company of its retirement benefit plans is shown in the following table:
 
Three Months Ended March 31
 
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2013
 
2012
 
2013
 
2012
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost

$129

 

$131

 

$ 9

 

$ 8

Interest cost
279

 
296

 
24

 
27

Expected return on plan assets
(453
)
 
(427
)
 
(19
)
 
(17
)
Amortization of:
 
 
 
 
 
 
 
Prior service credit
(14
)
 
(15
)
 
(12
)
 
(12
)
Net loss from previous years
152

 
107

 
7

 
5

Other

 
2

 

 

Net periodic benefit cost

$ 93

 

$ 94

 

$ 9

 

$ 11


Employer Contributions
The company’s required minimum funding in 2013 for its defined benefit pension plans and its post-retirement benefit plans is approximately $66 million and $110 million, respectively. For the three months ended March 31, 2013, contributions of $26 million have been made to the company’s defined benefit pension plans, and contributions of $8 million have been made to the company’s post-retirement benefit plans. Subsequently, in April 2013, the company made a $500 million voluntary contribution to its defined benefit pension plans. The company also sponsors defined contribution plans. For the three months ended March 31, 2013 and 2012, contributions of $75 million and $76 million, respectively, were made to these plans.