Summary Of Business Segment Data (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 15,304	$ 14,139	$ 11,807	$ 16,908	$ 17,911	$ 19,980	$ 15,751	$ 22,917	$ 58,158	$ 76,559	$ 101,127
Earnings from operations	(8,049)	(401)	(2,964)	(1,353)	(2,204)	1,259	(3,380)	2,350	(12,767)	(1,975)	11,987
Other income, net									447	438	92
Interest and debt expense									(2,156)	(722)	(475)
(Loss)/earnings before income taxes									(14,476)	(2,259)	11,604
Income tax benefit/(expense)									2,535	1,623	(1,144)
Net (loss)/earnings									(11,941)	(636)	10,460
Net Income (Loss) Attributable to Noncontrolling Interest									(68)
Net (loss)/earnings attributable to Boeing Shareholders	$ (8,420)	$ (449)	$ (2,376)	$ (628)	$ (1,010)	$ 1,167	$ (2,942)	$ 2,149	(11,873)	(636)	10,460
Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings from operations									(11,795)	(1,317)	12,137
Operating Segments [Member] | Commercial Airplanes
Segment Reporting Information [Line Items]
Revenues									16,162	32,255	57,499
Earnings from operations									(13,847)	(6,657)	7,830
Operating Segments [Member] | Defense, Space & Security
Segment Reporting Information [Line Items]
Revenues									26,257	26,095	26,300
Earnings from operations									1,539	2,615	1,692
Operating Segments [Member] | Global Services
Segment Reporting Information [Line Items]
Revenues									15,543	18,468	17,056
Earnings from operations									450	2,697	2,536
Operating Segments [Member] | Boeing Capital Corporation
Segment Reporting Information [Line Items]
Revenues									261	244	274
Earnings from operations									63	28	79
Corporate Reconciling Items And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues									(65)	(503)	(2)
Operating Income (Loss) Excluding Unallocated Pension and Postretirement Adjustments									2,355	2,073	1,477
FAS/CAS Service Cost Adjustment									$ (1,383)	$ (1,415)	$ (1,327)