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
		Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Shares excluded from the computation of diluted earnings		1.7	2.3
Net loss attributable to Boeing Shareholders		$ (537)	$ (628)
Undistributed Earnings Allocated to Participating Securities, Basic
Net (loss)/earnings available to common shareholders		$ (537)	$ (628)
Basic weighted average shares outstanding		585.4	565.9
Participating securities		0.4	0.5
Basic weighted average common shares outstanding		585.0	565.4
Basic weighted average shares outstanding		585.4	565.9
Dilutive potential common shares	[1]
Diluted weighted average shares outstanding		585.4	565.9
Participating securities		0.4	0.5
Diluted weighted average common shares outstanding		585.0	565.4
Earnings Per Share, Basic		$ (0.92)	$ (1.11)
Earnings Per Share, Diluted		$ (0.92)	$ (1.11)

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