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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The cost to the company of its retirement benefit plans is 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
2013
 
2012
 
2013
 
2012
2013
 
2012
 
2013
 
2012
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost

$129

 

$131

 

$ 9

 

$ 8


$ 387

 

$ 392

 

$27

 

$25

Interest cost
279

 
296

 
24

 
28

838

 
888

 
72

 
82

Expected return on plan assets
(452
)
 
(427
)
 
(19
)
 
(17
)
(1,357
)
 
(1,281
)
 
(57
)
 
(51
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(13
)
 
(13
)
(44
)
 
(44
)
 
(38
)
 
(38
)
Net loss from previous years
152

 
107

 
8

 
5

456

 
321

 
23

 
15

Other
—

 
—

 
—

 
—

—

 
2

 
—

 
—

Net periodic benefit cost

$ 93

 

$ 92

 

$ 9

 

$ 11


$ 280

 

$ 278

 

$27

 

$33