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Segment Information (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2015
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
2015
 
2014
 
2015
 
2014
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,512

 
$
2,502

 
$
5,010

 
$
4,922

Electronic Systems
1,683

 
1,744

 
3,364

 
3,388

Information Systems
1,485

 
1,562

 
3,059

 
3,139

Technical Services
720

 
732

 
1,490

 
1,429

Intersegment eliminations
(504
)
 
(501
)
 
(1,070
)
 
(991
)
Total sales
5,896

 
6,039

 
11,853

 
11,887

Operating income
 
 
 
 
 
 
 
Aerospace Systems
322

 
290

 
637

 
614

Electronic Systems
265

 
291

 
512

 
559

Information Systems
150

 
153

 
316

 
315

Technical Services
67

 
68

 
135

 
136

Intersegment eliminations
(62
)
 
(60
)
 
(123
)
 
(125
)
Total segment operating income
742


742

 
1,477

 
1,499

Reconciliation to total operating income:
 
 
 
 
 
 
 
Net FAS/CAS pension adjustment
81

 
110

 
164

 
220

Unallocated corporate expenses
(9
)
 
(31
)
 
(47
)
 
(53
)
Other
(1
)
 
(1
)
 
(1
)
 
(1
)
Total operating income
$
813

 
$
820

 
$
1,593

 
$
1,665