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Segment Information (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Sales and operating income by segment
The following table presents sales and operating income by segment:
 
Three Months Ended September 30
 
Nine Months Ended September 30
$ in millions
2014
 
2013
 
2014
 
2013
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,543

 
$
2,484

 
$
7,465

 
$
7,582

Electronic Systems
1,733

 
1,774

 
5,121

 
5,266

Information Systems
1,511

 
1,619

 
4,650

 
4,982

Technical Services
691

 
713

 
2,120

 
2,152

Intersegment eliminations
(494
)
 
(484
)
 
(1,485
)
 
(1,478
)
Total sales
5,984

 
6,106

 
17,871

 
18,504

Operating income
 
 
 
 
 
 
 
Aerospace Systems
402

 
330

 
1,016

 
936

Electronic Systems
274

 
273

 
833

 
891

Information Systems
150

 
162

 
465

 
474

Technical Services
66

 
67

 
202

 
201

Intersegment eliminations
(52
)
 
(69
)
 
(177
)
 
(194
)
Total segment operating income
840


763

 
2,339

 
2,308

Reconciliation to total operating income:
 
 
 
 
 
 
 
Net FAS/CAS pension adjustment
(20
)
 
61

 
200

 
125

Unallocated corporate expenses
(50
)
 
(33
)
 
(103
)
 
(73
)
Other
(1
)
 
(1
)
 
(2
)
 
(5
)
Total operating income
$
769

 
$
790

 
$
2,434

 
$
2,355