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Segment Information (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2015
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
2015
 
2014
Sales
 
 
 
Aerospace Systems
$
2,498

 
$
2,420

Electronic Systems
1,681

 
1,644

Information Systems
1,574

 
1,577

Technical Services
770

 
697

Intersegment eliminations
(566
)
 
(490
)
Total sales
5,957

 
5,848

Operating income
 
 
 
Aerospace Systems
315

 
324

Electronic Systems
247

 
268

Information Systems
166

 
162

Technical Services
68

 
68

Intersegment eliminations
(61
)
 
(65
)
Total segment operating income
735

 
757

Reconciliation to total operating income:
 
 
 
Net FAS/CAS pension adjustment
83

 
110

Unallocated corporate expenses
(38
)
 
(22
)
Total operating income
$
780

 
$
845