Earnings Per Share - Schedule of Weighted Average Number of Shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Basic
Net loss attributable to Boeing shareholders	$ (4)	$ (37)
Less: Mandatory convertible preferred stock dividends accumulated during the period	86	86
Less: earnings available to participating securities
Net loss available to common shareholders	$ (90)	$ (123)
Basic
Basic weighted average shares outstanding (in shares)	788.2	753.6
Participating securities (in shares)	0.2	0.2
Basic weighted average common shares outstanding (in shares)	788.0	753.4
Diluted
Diluted weighted average shares outstanding (in shares)	788.2	753.6
Participating securities (in shares)	0.2	0.2
Diluted weighted average common shares outstanding (in shares)	788.0	753.4
Basic net loss per share (in dollars per share)	$ (0.11)	$ (0.16)
Diluted net loss per share (in dollars per share)	$ (0.11)	$ (0.16)