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Segment Information (Tables) (Unaudited)
 6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Sales and operating income by segment
The following table presents sales and operating income by segment:
 
Three Months Ended June 30
 
Six Months Ended June 30
$ in millions
2013
 
2012
 
2013
 
2012
Sales
 
 
 
 
 
 
 
Aerospace Systems

$2,613

 

$2,404

 

$ 5,098

 

$ 4,787

Electronic Systems
1,771

 
1,744

 
3,492

 
3,468

Information Systems
1,689

 
1,856

 
3,363

 
3,700

Technical Services
722

 
783

 
1,439

 
1,533

Intersegment eliminations
(501
)
 
(513
)
 
(994
)
 
(1,016
)
Total sales
6,294

 
6,274

 
12,398

 
12,472

Operating income
 
 
 
 
 
 
 
Aerospace Systems
336

 
292

 
606

 
571

Electronic Systems
322

 
276

 
618

 
580

Information Systems
141

 
202

 
312

 
407

Technical Services
69

 
74

 
134

 
144

Intersegment eliminations
(71
)
 
(62
)
 
(125
)
 
(131
)
Total segment operating income
797


782

 
1,545

 
1,571

Reconciliation to total operating income:
 
 
 
 
 
 
 
Net FAS/CAS pension adjustment
31

 
35

 
64

 
67

Unallocated corporate expenses
(21
)
 
(39
)
 
(40
)
 
(62
)
Other
(1
)
 
(4
)
 
(4
)
 
(6
)
Total operating income

$ 806

 

$ 774

 

$ 1,565

 

$ 1,570