Earnings Per Share (Schedule Of Weighted-Average Number Of Shares Outstanding Used To Compute Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss)/earnings attributable to Boeing Shareholders	$ (8,420)	$ (449)	$ (2,376)	$ (628)	$ (1,010)	$ 1,167	$ (2,942)	$ 2,149	$ (11,873)	$ (636)	$ 10,460
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic											7
Net earnings available to common shareholders									$ (11,873)	$ (636)	$ 10,453
Basic weighted average shares outstanding									569.0	566.0	579.9
Participating securities									0.4	0.6	0.7
Basic weighted average common shares outstanding									568.6	565.4	579.2
Basic weighted average shares outstanding									569.0	566.0	579.9
Dilutive potential common shares											6.3	[1]
Dilutive weighted average shares outstanding									569.0	566.0	586.2
Participating securities									0.4	0.6	0.7
Diluted weighted average common shares outstanding									568.6	565.4	585.5
Income (Loss) from Continuing Operations, Per Basic Share											$ 18.05
Income (Loss) from Continuing Operations, Per Diluted Share											$ 17.85

[1] Diluted (loss)/earnings per share includes any dilutive impact of stock options, restricted stock units, performance-based restricted stock units and performance awards.