Acquisitions, Divestitures, Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

The changes in the carrying amount of goodwill by reporting unit were as follows:



	Aerospace			Combat Systems			Information Systems and Technology			Marine Systems			Total Goodwill
December 31, 2012 (a)	$	2,697		$	2,916		$	6,100		$	290		$	12,003
Acquisitions (b)	—			2			1			(1		)	2
Other (c)	44			(69		)	(48		)	—			(73		)
December 31, 2013	$	2,741		$	2,849		$	6,053		$	289		$	11,932
Acquisitions (b)	—			—			127			—			127
Other (c)	(186		)	(99		)	(43		)	—			(328		)
December 31, 2014	$	2,555		$	2,750		$	6,137		$	289		$	11,731

(a)Goodwill on December 31, 2012, in the Information Systems and Technology reporting unit is net of $1,994 of accumulated impairment losses.

(b)Includes adjustments during the purchase price allocation period.

(c)Consists primarily of adjustments for foreign currency translation

Intangible assets consisted of the following:



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	December 31, 2014							December 31, 2013
Contract and program intangible assets*	$	1,652	$	(1,123	)	$	529	$	1,790	$	(1,189	)	$	601
Trade names and trademarks	462		(113		)	349		507		(103		)	404
Technology and software	130		(97		)	33		130		(92		)	38
Other intangible assets	154		(153		)	1		155		(154		)	1
Total intangible assets	$	2,398	$	(1,486	)	$	912	$	2,582	$	(1,538	)	$	1,044

* Consists of acquired backlog and probable follow-on work and associated customer relationships

The amortization lives (in years) of our intangible assets on December 31, 2014, were as follows:



		Range of
		Amortization Life
Contract and program intangible assets		7-30
Trade names and trademarks		30
Technology and software		7-15
Other intangible assets		5

We expect to record annual amortization expense over the next five years as follows: