Goodwill and Other Purchased Intangible Assets (Unaudited) Goodwill and Other Purchased Intangible Assets (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amounts of goodwill were as follows:

$ in millions	Aerospace Systems		Innovation Systems		Mission Systems			Technology Services			Total
Balance as of December 31, 2017	$	3,742	$	—	$	6,696		$	2,017		$	12,455
Acquisition of Orbital ATK	418		5,225		469			79			6,191
Other(1)	—		—		(1		)	(3		)	(4		)
Balance as of September 30, 2018	$	4,160	$	5,225	$	7,164		$	2,093		$	18,642

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

Schedule of Purchased Intangible Assets

Net customer-related and other intangible assets, including the fair value of purchased intangible assets acquired in the Merger, are as follows:

	September 30, 2018			December 31, 2017
$ in millions
Gross customer-related and other intangible assets	$	3,358		$	1,833
Less accumulated amortization	(1,898		)	(1,781		)
Net customer-related and other intangible assets	$	1,460		$	52

Expected Future Amortization of Purchased Intangibles

As of September 30, 2018, the expected future amortization of purchased intangibles for each of the next five years is as follows:

$ in millions
2018 (remainder of year)	$	90
2019	331
2020	262
2021	204
2022	197