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Retirement Benefits (Tables) (Unaudited)
 3 Months Ended
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The cost of the company’s pension plans and post-retirement medical and life benefit plans is shown in the following table:
 
Three Months Ended
March 31
 
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2012
 
2011
 
2012
 
2011
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost

$131

 

$130

 

$ 8

 

$ 8

Interest cost
296

 
305

 
27

 
29

Expected return on plan assets
(427
)
 
(423
)
 
(17
)
 
(16
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost (credit)
(15
)
 
6

 
(12
)
 
(13
)
Net loss from previous years
107

 
41

 
5

 
3

Other
2

 
—

 
—

 
—

Net periodic benefit cost

$ 94

 

$ 59

 

$11

 

$11