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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The cost to the company of its defined benefit retirement 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
2014
 
2013
 
2014
 
2013
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
114

 
$
129

 
$
8

 
$
9

$
343

 
$
387

 
$
25

 
$
27

Interest cost
314

 
279

 
25

 
24

944

 
838

 
75

 
72

Expected return on plan assets
(467
)
 
(452
)
 
(21
)
 
(19
)
(1,402
)
 
(1,357
)
 
(63
)
 
(57
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(14
)
 
(15
)
 
(12
)
 
(13
)
(44
)
 
(44
)
 
(32
)
 
(38
)
Net loss from previous years
81

 
152

 
3

 
8

245

 
456

 
9

 
23

Other
1

 
—

 
—

 
—

1

 
—

 
—

 
—

Net periodic benefit cost
$
29

 
$
93

 
$
3

 
$
9

$
87

 
$
280

 
$
14

 
$
27