BOEING CO | 2013 | FY |

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



	2013								2012
	Gross Carrying Amount				Accumulated Amortization				Gross Carrying Amount				Accumulated Amortization
Distribution rights		$2,275				$483				$2,132				$388
Product know-how	507				199				507				171
Customer base	615				347				617				300
Developed technology	853				742				865				717
Other	233				157				214				145
Total		$4,483				$1,928				$4,335				$1,721

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Changes in the carrying amount of goodwill by reportable segment for the years ended December 31, 2013, 2012 and 2011 were as follows:



	Commercial Airplanes				Boeing Military Aircraft				Network & Space Systems				Global Services & Support				Total
Balance at January 1, 2011		$2,110				$1,041				$1,461				$325				$4,937
Acquisitions									16								16
Goodwill adjustments	(4		)						(4		)						(8		)
Balance at December 31, 2011		$2,106				$1,041				$1,473				$325				$4,945
Acquisitions	12												72				84
Goodwill adjustments	7								(1		)						6
Balance at December 31, 2012		$2,125				$1,041				$1,472				$397				$5,035
Acquisitions					18								7				25
Goodwill adjustments ⁽¹⁾	(17		)		(45		)		41				4				(17		)
Balance at December 31, 2013		$2,108				$1,014				$1,513				$408				$5,043

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Estimated amortization expense for the five succeeding years is as follows:



	2014				2015				2016				2017				2018
Estimated amortization expense		$219				$214				$199				$193				$186

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