Basis of Presentation - Schedule of Change in Accounting Estimate (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Increase/(decrease) to Revenue	$ 22	$ (140)
Decrease to Earnings from operations	$ (31)	$ (151)
Increase to Diluted loss per share (in dollars per share)	$ (0.04)	$ (0.22)

Changes in estimated revenues 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.

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