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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The cost to the company of its defined benefit retirement plans are shown in the following table:
 
Three Months Ended March 31
 
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
114

 
$
129

 
$
8

 
$
9

Interest cost
315

 
279

 
26

 
24

Expected return on plan assets
(467
)
 
(453
)
 
(21
)
 
(19
)
Amortization of:
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(14
)
 
(7
)
 
(12
)
Net loss from previous years
82

 
152

 
2

 
7

Net periodic benefit cost
$
29

 
$
93

 
$
8

 
$
9