Goodwill And Acquired Intangibles

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill by reportable segment for the years ended December 31, 2018 and 2017 were as follows:



	Commercial Airplanes		Defense, Space & Security		Global Services			Total
Balance at January 1, 2017		$992		$2,854		$1,478			$5,324
Acquisitions			220					220
Goodwill adjustments					15			15
Balance at December 31, 2017		$992		$3,074		$1,493			$5,559
KLX Acquisition	249				1,861			2,110
Other Acquisitions			180		3			183
Goodwill adjustments					(12		)	(12		)
Balance at December 31, 2018		$1,241		$3,254		$3,345			$7,840

As of December 31, 2018 and 2017, we had indefinite-lived intangible assets with carrying amounts of $490 relating to trade names.

The gross carrying amounts and accumulated amortization of our acquired finite-lived intangible assets were as follows at December 31:



	2018				2017
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Distribution rights		$2,879		$1,101		$2,445		$943
Product know-how	536		324		522		298
Customer base	1,284		523		650		479
Developed technology	595		439		556		406
Other	218		186		213		177
Total		$5,512		$2,573		$4,386		$2,303

Amortization expense for acquired finite-lived intangible assets for the years ended December 31, 2018 and 2017 was $272 and $240. Estimated amortization expense for the five succeeding years is as follows:



	2019		2020		2021		2022		2023
Estimated amortization expense		$333		$306		$299		$285		$266

During 2018 and 2017 we acquired $1,133 and $298 of finite-lived intangible assets, of which $0 and $55 related to non-cash investing and financing transactions.