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Segment Information (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2017
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
2017
 
2016
 
2017
 
2016
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,970

 
$
2,600

 
$
5,868

 
$
5,174

Mission Systems
2,781

 
2,690

 
5,520

 
5,383

Technology Services
1,175

 
1,213

 
2,369

 
2,427

Intersegment eliminations
(551
)
 
(503
)
 
(1,115
)
 
(1,028
)
Total sales
6,375

 
6,000

 
12,642

 
11,956

Operating income
 
 
 
 
 
 
 
Aerospace Systems
315

 
312

 
627

 
598

Mission Systems
374

 
351

 
727

 
704

Technology Services
134

 
131

 
265

 
257

Intersegment eliminations
(70
)
 
(63
)
 
(140
)
 
(127
)
Total segment operating income
753


731

 
1,479

 
1,432

Net FAS/CAS pension adjustment
137

 
69

 
273

 
143

Unallocated corporate expenses
(34
)
 
(3
)
 
(63
)
 
(36
)
Other
(1
)
 
—

 
(2
)
 
(3
)
Total operating income
$
855

 
$
797

 
$
1,687

 
$
1,536