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Segment Information (Tables) (Unaudited)
 9 Months Ended
Sep. 30, 2012
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
2012
 
2011
 
2012
 
2011
Sales
 
 
 
 
 
 
 
Aerospace Systems

$2,586

 

$2,455

 

$ 7,373

 

$ 7,521

Electronic Systems
1,707

 
1,905

 
5,175

 
5,504

Information Systems
1,776

 
1,955

 
5,476

 
6,011

Technical Services
748

 
796

 
2,281

 
2,403

Intersegment eliminations
(547
)
 
(499
)
 
(1,563
)
 
(1,533
)
Total sales
6,270

 
6,612

 
18,742

 
19,906

Operating income
 
 
 
 
 
 
 
Aerospace Systems
288

 
295

 
859

 
902

Electronic Systems
279

 
293

 
859

 
814

Information Systems
170

 
187

 
577

 
570

Technical Services
62

 
63

 
206

 
193

Intersegment eliminations
(69
)
 
(61
)
 
(200
)
 
(197
)
Total segment operating income
730


777


2,301


2,282

Reconciliation to operating income:
 
 
 
 
 
 
 
Unallocated corporate expenses
(27
)
 
(48
)
 
(89
)
 
(96
)
Net FAS/CAS pension adjustment
34

 
100

 
101

 
302

Royalty income adjustment
(1
)
 
(4
)
 
(7
)
 
(11
)
Total operating income

$ 736

 

$ 825

 

$ 2,306

 

$ 2,477