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Segment Information (Tables) (Unaudited)
 3 Months Ended
Mar. 31, 2012
Segment Reporting [Abstract]  
Sales and operating income by segment
The following table presents sales and operating income by segment:
 
Three Months Ended
March 31
$ in millions
2012
 
2011
Sales
 
 
 
Aerospace Systems

$2,383

 

$2,593

Electronic Systems
1,724

 
1,808

Information Systems
1,844

 
2,025

Technical Services
750

 
831

Intersegment eliminations
(503
)
 
(523
)
Total sales

$6,198

 

$6,734

Operating income
 
 
 
Aerospace Systems

$ 279

 

$ 287

Electronic Systems
304

 
237

Information Systems
205

 
194

Technical Services
70

 
68

Intersegment eliminations
(69
)
 
(65
)
Total segment operating income
789

 
721

Reconciliation to operating income:
 
 
 
Unallocated corporate expenses
(23
)
 
(10
)
Net pension adjustment
32

 
103

Royalty income adjustment
(2
)
 
(3
)
Total operating income

$ 796

 

$ 811