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Segment Information (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2016
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
2016
 
2015
Sales
 
 
 
Aerospace Systems
$
2,574

 
$
2,498

Mission Systems
2,693

 
2,711

Technology Services
1,214

 
1,267

Intersegment eliminations
(525
)
 
(519
)
Total sales
5,956

 
5,957

Operating income
 
 
 
Aerospace Systems
286

 
312

Mission Systems
353

 
344

Technology Services
126

 
133

Intersegment eliminations
(64
)
 
(54
)
Total segment operating income
701

 
735

Reconciliation to total operating income:
 
 
 
Net FAS/CAS pension adjustment
74

 
83

Unallocated corporate expenses
(33
)
 
(38
)
Other
(3
)
 
—

Total operating income
$
739

 
$
780