Goodwill And Acquired Intangibles (Schedule Of Goodwill By Reportable Segment) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, Beginning Balance		$ 5,324	$ 5,126
Acquisitions		220	206
Goodwill adjustments		15	(8)
Goodwill, Ending Balance		5,559	5,324
Operating Segments [Member] | Commercial Airplanes [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance		992	992
Acquisitions
Goodwill adjustments
Goodwill, Ending Balance		992	992
Operating Segments [Member] | Defense, Space & Security [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance		2,854	2,648
Acquisitions	[1]	220	206
Goodwill adjustments
Goodwill, Ending Balance		3,074	2,854
Operating Segments [Member] | Global Services [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance		1,478	1,486
Acquisitions
Goodwill adjustments		15	(8)
Goodwill, Ending Balance		$ 1,493	$ 1,478

[1] The increase in goodwill is primarily the result of acquisitions in the fourth quarter of 2016 and 2017.