Earnings Per Share - Schedule of Weighted Average Number of Shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Basic
Net earnings/(loss) attributable to Boeing shareholders	$ 2,235	$ (11,817)	$ (2,222)
Less: Mandatory convertible preferred stock dividends accumulated during the period	345	58
Less: earnings available to participating securities	1
Net earnings/(loss) attributable to Boeing common shareholders	1,889	(11,875)	(2,222)
Diluted
Basic Net earnings/(loss) available to common shareholders	1,889	(11,875)	(2,222)
Add: Mandatory convertible preferred stock dividends accumulated during the period
Add: interest expense on Exchangeable Notes, net of tax
Net earnings/(loss) attributable to Boeing common shareholders	$ 1,889	$ (11,875)	$ (2,222)
Basic
Basic weighted average shares outstanding (in shares)	760.0	647.2	606.1
Participating securities (in shares)	0.2	0.3	0.3
Basic weighted average common shares outstanding (in shares)	759.8	646.9	605.8
Diluted
Basic weighted average shares outstanding (in shares)	760.0	647.2	606.1
Dilutive potential common shares (in shares)	2.5
Diluted weighted average shares outstanding (in shares)	762.5	647.2	606.1
Participating securities (in shares)	0.2	0.3	0.3
Diluted weighted average common shares outstanding (in shares)	762.3	646.9	605.8
Basic (in dollars per share)	$ 2.49	$ (18.36)	$ (3.67)
Diluted (in dollars per share)	$ 2.48	$ (18.36)	$ (3.67)