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

$2,404

 

$2,473

 

$ 4,787

 

$ 5,066

Electronic Systems
1,744

 
1,791

 
3,468

 
3,599

Information Systems
1,856

 
2,031

 
3,700

 
4,056

Technical Services
783

 
776

 
1,533

 
1,607

Intersegment eliminations
(513
)
 
(511
)
 
(1,016
)
 
(1,034
)
Total sales
6,274

 
6,560

 
12,472

 
13,294

Operating income
 
 
 
 
 
 
 
Aerospace Systems
292

 
320

 
571

 
607

Electronic Systems
276

 
284

 
580

 
521

Information Systems
202

 
189

 
407

 
383

Technical Services
74

 
62

 
144

 
130

Intersegment eliminations
(62
)
 
(71
)
 
(131
)
 
(136
)
Total segment operating income
782

 
784

 
1,571

 
1,505

Reconciliation to operating income:
 
 
 
 
 
 
 
Unallocated corporate expenses
(39
)
 
(38
)
 
(62
)
 
(48
)
Net pension adjustment
35

 
99

 
67

 
202

Royalty income adjustment
(4
)
 
(4
)
 
(6
)
 
(7
)
Total operating income

$ 774

 

$ 841

 

$ 1,570

 

$ 1,652