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Segment Information (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2016
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
2016
 
2015
 
2016
 
2015
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,600

 
$
2,498

 
$
5,174

 
$
4,996

Mission Systems
2,690

 
2,628

 
5,383

 
5,339

Technology Services
1,213

 
1,238

 
2,427

 
2,505

Intersegment eliminations
(503
)
 
(468
)
 
(1,028
)
 
(987
)
Total sales
6,000

 
5,896

 
11,956

 
11,853

Operating income
 
 
 
 
 
 
 
Aerospace Systems
312

 
319

 
598

 
631

Mission Systems
351

 
348

 
704

 
692

Technology Services
131

 
128

 
257

 
261

Intersegment eliminations
(63
)
 
(53
)
 
(127
)
 
(107
)
Total segment operating income
731


742

 
1,432

 
1,477

Reconciliation to total operating income:
 
 
 
 
 
 
 
Net FAS/CAS pension adjustment
69

 
81

 
143

 
164

Unallocated corporate expenses
(3
)
 
(9
)
 
(36
)
 
(47
)
Other
—

 
(1
)
 
(3
)
 
(1
)
Total operating income
$
797

 
$
813

 
$
1,536

 
$
1,593