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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Shares excluded from the computation of diluted earnings		2.7	1.3	2.3	1.6
Net loss attributable to Boeing Shareholders		$ (109)	$ (449)	$ (59)	$ (3,453)
Undistributed Earnings Allocated to Participating Securities, Basic
Net (loss)/earnings available to common shareholders		$ (109)	$ (449)	$ (59)	$ (3,453)
Basic weighted average shares outstanding		589.0	566.6	587.3	566.3
Participating securities		0.4	0.5	0.4	0.5
Basic weighted average common shares outstanding		588.6	566.1	586.9	565.8
Basic weighted average shares outstanding		589.0	566.6	587.3	566.3
Dilutive potential common shares	[1]
Diluted weighted average shares outstanding		589.0	566.6	587.3	566.3
Participating securities		0.4	0.5	0.4	0.5
Diluted weighted average common shares outstanding		588.6	566.1	586.9	565.8
Earnings Per Share, Basic		$ (0.19)	$ (0.79)	$ (0.10)	$ (6.10)
Earnings Per Share, Diluted		$ (0.19)	$ (0.79)	$ (0.10)	$ (6.10)

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