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Segment Information (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2017
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
2017
 
2016
 
2017
 
2016
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
3,082

 
$
2,782

 
$
8,950

 
$
7,956

Mission Systems
2,837

 
2,698

 
8,357

 
8,081

Technology Services
1,183

 
1,190

 
3,552

 
3,617

Intersegment eliminations
(575
)
 
(515
)
 
(1,690
)
 
(1,543
)
Total sales
6,527

 
6,155

 
19,169

 
18,111

Operating income
 
 
 
 
 
 
 
Aerospace Systems
334

 
311

 
961

 
909

Mission Systems
363

 
351

 
1,090

 
1,055

Technology Services
133

 
130

 
398

 
387

Intersegment eliminations
(71
)
 
(61
)
 
(211
)
 
(188
)
Total segment operating income
759


731

 
2,238

 
2,163

Net FAS/CAS pension adjustment
172

 
91

 
445

 
234

Unallocated corporate expenses
(85
)
 
5

 
(148
)
 
(31
)
Other
(1
)
 
(1
)
 
(3
)
 
(4
)
Total operating income
$
845

 
$
826

 
$
2,532

 
$
2,362