Summary Of Business Segment Data (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,278			$ 14,139	$ 47,493	$ 42,854
Earnings/(loss) from operations	329			(401)	1,269	(4,718)
Other income, net	30			119	419	325
Interest and debt expense	(669)			(643)	(2,021)	(1,458)
(Loss)/earnings before income taxes	(310)	$ 549	$ (572)	(925)	(333)	(5,851)
Income tax benefit	178			459	207	2,349
Net loss	(132)			(466)	(126)	(3,502)
Less: net loss attributable to noncontrolling interest	(23)			(17)	(67)	(49)
Net loss attributable to Boeing Shareholders	(109)			(449)	(59)	(3,453)
Operating Segments
Segment Reporting Information [Line Items]
Earnings/(loss) from operations	429			(440)	1,493	(4,808)
Operating Segments | Commercial Airplanes
Segment Reporting Information [Line Items]
Revenues	4,459			3,596	14,743	11,434
Earnings/(loss) from operations	(693)			(1,369)	(2,021)	(6,199)
Operating Segments | Defense, Space & Security
Segment Reporting Information [Line Items]
Revenues	6,617			6,848	20,678	19,478
Earnings/(loss) from operations	436			628	1,799	1,037
Operating Segments | Global Services
Segment Reporting Information [Line Items]
Revenues	4,221			3,694	12,037	11,810
Earnings/(loss) from operations	644			271	1,616	307
Operating Segments | Boeing Capital
Segment Reporting Information [Line Items]
Revenues	71			71	209	205
Earnings/(loss) from operations	42			30	99	47
Corporate Reconciling Items And Eliminations
Segment Reporting Information [Line Items]
Revenues	(90)			(70)	(174)	(73)
Unallocated items, eliminations and other	(370)			(314)	(1,032)	(965)
FAS/CAS service cost adjustment	$ 270			$ 353	$ 808	$ 1,055