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Segment Information (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2014
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
2014
 
2013
 
2014
 
2013
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,502

 
$
2,613

 
$
4,922

 
$
5,098

Electronic Systems
1,744

 
1,771

 
3,388

 
3,492

Information Systems
1,562

 
1,689

 
3,139

 
3,363

Technical Services
732

 
722

 
1,429

 
1,439

Intersegment eliminations
(501
)
 
(501
)
 
(991
)
 
(994
)
Total sales
6,039

 
6,294

 
11,887

 
12,398

Operating income
 
 
 
 
 
 
 
Aerospace Systems
290

 
336

 
614

 
606

Electronic Systems
291

 
322

 
559

 
618

Information Systems
153

 
141

 
315

 
312

Technical Services
68

 
69

 
136

 
134

Intersegment eliminations
(60
)
 
(71
)
 
(125
)
 
(125
)
Total segment operating income
742


797

 
1,499

 
1,545

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

 
31

 
220

 
64

Unallocated corporate expenses
(31
)
 
(21
)
 
(53
)
 
(40
)
Other
(1
)
 
(1
)
 
(1
)
 
(4
)
Total operating income
$
820

 
$
806

 
$
1,665

 
$
1,565