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Retirement Benefits (Unaudited)
 9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
RETIREMENT BENEFITS
RETIREMENT BENEFITS
The cost of the company’s pension plans and post-retirement medical and life benefit plans are shown in the following table:
 
Three Months Ended September 30
 
Nine Months Ended September 30
 
Pension
Benefits
 
Medical and
Life Benefits
 
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost

$131

 

$130

 

$ 8

 

$ 8

 

$ 392

 

$ 390

 

$25

 

$24

Interest cost
296

 
305

 
28

 
29

 
888

 
915

 
82

 
87

Expected return on plan assets
(427
)
 
(423
)
 
(17
)
 
(16
)
 
(1,281
)
 
(1,269
)
 
(51
)
 
(48
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
(15
)
 
6

 
(13
)
 
(13
)
 
(44
)
 
18

 
(38
)
 
(39
)
Net loss from previous years
107

 
41

 
5

 
3

 
321

 
123

 
15

 
9

Other
—

 
—

 
—

 
—

 
2

 
—

 
—

 
—

Net periodic benefit cost

$ 92

 

$ 59

 

$11

 

$11

 

$ 278

 

$ 177

 

$33

 

$33


Employer Contributions
The company’s required minimum funding in 2012 for its defined benefit pension plans and its post-retirement medical and life benefit plans is approximately $65 million and $120 million, respectively. For the nine months ended September 30, 2012, contributions of $349 million have been made to the company’s defined benefit pension plans, including a voluntary pension contribution totaling $300 million, and contributions of $75 million have been made to the company’s post-retirement medical and life benefit plans.
The company also sponsors defined contribution plans. For the three months ended September 30, 2012, and 2011, contributions of $66 million and $64 million, respectively, were made to these plans. For the nine months ended September 30, 2012 and 2011, contributions of $218 million and $225 million, respectively, were made to these plans.