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Segment Information (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Sales and operating income by segment
The following table presents sales and operating income by segment:
 
Three Months Ended September 30
 
Nine Months Ended September 30
$ in millions
2016
 
2015
 
2016
 
2015
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,782

 
$
2,544

 
$
7,956

 
$
7,540

Mission Systems
2,698

 
2,723

 
8,081

 
8,062

Technology Services
1,190

 
1,193

 
3,617

 
3,698

Intersegment eliminations
(515
)
 
(481
)
 
(1,543
)
 
(1,468
)
Total sales
6,155

 
5,979

 
18,111

 
17,832

Operating income
 
 
 
 
 
 
 
Aerospace Systems
311

 
298

 
909

 
929

Mission Systems
351

 
355

 
1,055

 
1,047

Technology Services
130

 
128

 
387

 
389

Intersegment eliminations
(61
)
 
(55
)
 
(188
)
 
(162
)
Total segment operating income
731


726

 
2,163

 
2,203

Reconciliation to total operating income:
 
 
 
 
 
 
 
Net FAS/CAS pension adjustment
91

 
97

 
234

 
261

Unallocated corporate expenses
5

 
(29
)
 
(31
)
 
(76
)
Other
(1
)
 
—

 
(4
)
 
(1
)
Total operating income
$
826

 
$
794

 
$
2,362

 
$
2,387