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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 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 June 30
Six Months Ended June 30
 
Pension
Benefits
 
Medical and
Life Benefits
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2014
 
2013
 
2014
 
2013
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
115

 
$
129

 
$
9

 
$
9

$
229

 
$
258

 
$
17

 
$
18

Interest cost
315

 
280

 
24

 
24

630

 
559

 
50

 
48

Expected return on plan assets
(468
)
 
(452
)
 
(21
)
 
(19
)
(935
)
 
(905
)
 
(42
)
 
(38
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(13
)
 
(13
)
(30
)
 
(29
)
 
(20
)
 
(25
)
Net loss from previous years
82

 
152

 
4

 
8

164

 
304

 
6

 
15

Net periodic benefit cost
$
29

 
$
94

 
$
3

 
$
9

$
58

 
$
187

 
$
11

 
$
18