Summary of Significant Accounting Policies - Schedule of Change in Accounting Estimate (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Decrease to Revenue	$ (916)	$ (2,794)	$ (1,706)
Decrease/increase to Earnings/(loss) from operations	$ (1,377)	$ (6,562)	$ (2,943)
Decrease/increase to Diluted earnings/(loss) per share (in dollars per share)	$ (1.53)	$ (9.83)	$ (5.43)

Changes in estimated revenues, cost of sales and the related effect on operating income are recognized using a cumulative catch-up adjustment which recognizes in the current period the cumulative effect of the changes on current and prior periods based on a contract’s percent complete

No definition available.

Name:	ba_IncreaseDecreaseInEarningsFromOperationsDueToChangeInAccountingEstimate
Namespace Prefix:	ba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration