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Segment Information (Tables) (Unaudited)
 3 Months Ended
Mar. 31, 2013
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
2013
 
2012
Sales
 
 
 
Aerospace Systems

$2,485

 

$2,383

Electronic Systems
1,721

 
1,724

Information Systems
1,674

 
1,844

Technical Services
717

 
750

Intersegment eliminations
(493
)
 
(503
)
Total sales
6,104

 
6,198

Operating income
 
 
 
Aerospace Systems
270

 
279

Electronic Systems
296

 
304

Information Systems
171

 
205

Technical Services
65

 
70

Intersegment eliminations
(54
)
 
(69
)
Total segment operating income
748


789

Reconciliation to total operating income:
 
 
 
Net FAS/CAS pension adjustment
33

 
32

Unallocated corporate expenses
(19
)
 
(23
)
Other
(3
)
 
(2
)
Total operating income

$ 759

 

$ 796