Goodwill and Acquired Intangibles (Tables)

12 Months Ended

Dec. 31, 2017

Changes in the carrying amount of goodwill by segment were as follows (in millions):



	Aeronautics		MFC		RMS			Space			Total
Balance at December 31, 2015	$	171	$	2,198	$	6,738		$	1,588		$	10,695
Purchase accounting adjustments	—		—		78			—			78
Other	—		62		(68		)	(3		)	(9		)
Balance at December 31, 2016	171		2,260		6,748			1,585			10,764
Other	—		5		36			2			43
Balance at December 31, 2017	$	171	$	2,265	$	6,784		$	1,587		$	10,807

The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (in millions):



	2017							2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Finite-Lived:
Customer programs	$	3,184	$	(503	)	$	2,681	$	3,184	$	(273	)	$	2,911
Customer relationships	352		(140		)	212		359		(92		)	267
Other	71		(54		)	17		111		(83		)	28
Total finite-lived intangibles	3,607		(697		)	2,910		3,654		(448		)	3,206
Indefinite-Lived:
Trademarks	887		—			887		887		—			887
Total acquired intangibles	$	4,494	$	(697	)	$	3,797	$	4,541	$	(448	)	$	4,093

The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (in millions):



	2017							2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Finite-Lived:
Customer programs	$	3,184	$	(503	)	$	2,681	$	3,184	$	(273	)	$	2,911
Customer relationships	352		(140		)	212		359		(92		)	267
Other	71		(54		)	17		111		(83		)	28
Total finite-lived intangibles	3,607		(697		)	2,910		3,654		(448		)	3,206
Indefinite-Lived:
Trademarks	887		—			887		887		—			887
Total acquired intangibles	$	4,494	$	(697	)	$	3,797	$	4,541	$	(448	)	$	4,093