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Goodwill and Other Purchased Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Changes in the carrying amounts of goodwill for the years ended December 31, 2016 and 2017, were as follows:
$ in millions
 
Aerospace Systems
 
Mission Systems
 
Technology Services
 
Total
Balance as of December 31, 2015
 
$
3,742

 
$
6,704

 
$
2,014

 
$
12,460

Businesses sold and other(1)
 
—

 
(10
)
 
—

 
(10
)
Balance as of December 31, 2016
 
$
3,742

 
$
6,694

 
$
2,014

 
$
12,450

Other(1)
 
—

 
2

 
3

 
5

Balance as of December 31, 2017
 
$
3,742

 
$
6,696

 
$
2,017

 
$
12,455

(1) 
Other consists primarily of adjustments for foreign currency translation.