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Segment Information (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2013
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
2013
 
2012
 
2013
 
2012
Sales
 
 
 
 
 
 
 
Aerospace Systems

$2,484

 

$2,586

 

$7,582

 

$7,373

Electronic Systems
1,774

 
1,707

 
5,266

 
5,175

Information Systems
1,619

 
1,776

 
4,982

 
5,476

Technical Services
713

 
748

 
2,152

 
2,281

Intersegment eliminations
(484
)
 
(547
)
 
(1,478
)
 
(1,563
)
Total sales
6,106

 
6,270

 
18,504

 
18,742

Operating income
 
 
 
 
 
 
 
Aerospace Systems
330

 
288

 
936

 
859

Electronic Systems
273

 
279

 
891

 
859

Information Systems
162

 
170

 
474

 
577

Technical Services
67

 
62

 
201

 
206

Intersegment eliminations
(69
)
 
(69
)
 
(194
)
 
(200
)
Total segment operating income
763


730

 
2,308

 
2,301

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

 
34

 
125

 
101

Unallocated corporate expenses
(33
)
 
(27
)
 
(73
)
 
(89
)
Other
(1
)
 
(1
)
 
(5
)
 
(7
)
Total operating income

$ 790

 

$ 736

 

$2,355

 

$2,306