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Segment Information (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2014
Segment Reporting [Abstract]  
Sales and operating income by segment
The following table presents sales and operating income by segment:
 
Three Months Ended March 31
$ in millions
2014
 
2013
Sales
 
 
 
Aerospace Systems
$
2,420

 
$
2,485

Electronic Systems
1,644

 
1,721

Information Systems
1,577

 
1,674

Technical Services
697

 
717

Intersegment eliminations
(490
)
 
(493
)
Total sales
5,848

 
6,104

Operating income
 
 
 
Aerospace Systems
324

 
270

Electronic Systems
268

 
296

Information Systems
162

 
171

Technical Services
68

 
65

Intersegment eliminations
(65
)
 
(54
)
Total segment operating income
757

 
748

Reconciliation to total operating income:
 
 
 
Net FAS/CAS pension adjustment
110

 
33

Unallocated corporate expenses
(22
)
 
(19
)
Other
—

 
(3
)
Total operating income
$
845

 
$
759