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		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Shares excluded from the computation of diluted earnings		1.3		1.6
Net (loss)/earnings attributable to Boeing Shareholders		$ (449)	$ 1,167	$ (3,453)	$ 374
Undistributed Earnings Allocated to Participating Securities, Basic			1
Net (loss)/earnings available to common shareholders		$ (449)	$ 1,166	$ (3,453)	$ 374
Basic weighted average shares outstanding		566.6	565.2	566.3	566.2
Participating securities		0.5	0.6	0.5	0.6
Basic weighted average common shares outstanding		566.1	564.6	565.8	565.6
Basic weighted average shares outstanding		566.6	565.2	566.3	566.2
Dilutive potential common shares	[1]		4.0		4.2
Diluted weighted average shares outstanding		566.6	569.2	566.3	570.4
Participating securities		0.5	0.6	0.5	0.6
Diluted weighted average common shares outstanding		566.1	568.6	565.8	569.8
Earnings Per Share, Basic		$ (0.79)	$ 2.07	$ (6.10)	$ 0.66
Earnings Per Share, Diluted		$ (0.79)	$ 2.05	$ (6.10)	$ 0.66

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