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Segment Information (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2015
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
2015
 
2014
 
2015
 
2014
Sales
 
 
 
 
 
 
 
Aerospace Systems
$
2,563

 
$
2,543

 
$
7,573

 
$
7,465

Electronic Systems
1,767

 
1,733

 
5,131

 
5,121

Information Systems
1,472

 
1,511

 
4,531

 
4,650

Technical Services
695

 
691

 
2,185

 
2,120

Intersegment eliminations
(518
)
 
(494
)
 
(1,588
)
 
(1,485
)
Total sales
5,979

 
5,984

 
17,832

 
17,871

Operating income
 
 
 
 
 
 
 
Aerospace Systems
303

 
402

 
940

 
1,016

Electronic Systems
275

 
274

 
787

 
833

Information Systems
146

 
150

 
462

 
465

Technical Services
64

 
66

 
199

 
202

Intersegment eliminations
(62
)
 
(52
)
 
(185
)
 
(177
)
Total segment operating income
726


840

 
2,203

 
2,339

Reconciliation to total operating income:
 
 
 
 
 
 
 
Net FAS/CAS pension adjustment
97

 
(20
)
 
261

 
200

Unallocated corporate expenses
(29
)
 
(50
)
 
(76
)
 
(103
)
Other
—

 
(1
)
 
(1
)
 
(2
)
Total operating income
$
794

 
$
769

 
$
2,387

 
$
2,434