Quarterly Financial Data (Schedule Of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 15,304	$ 14,139	$ 11,807	$ 16,908	$ 17,911	$ 19,980	$ 15,751	$ 22,917	$ 58,158	$ 76,559	$ 101,127
Cost of Revenue	20,992	13,105	12,978	16,768	18,708	16,930	17,810	18,645	63,843	72,093	81,490
Earnings from operations	(8,049)	(401)	(2,964)	(1,353)	(2,204)	1,259	(3,380)	2,350	(12,767)	(1,975)	11,987
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
Basic (loss)/earnings per share	$ (14.65)	$ (0.79)	$ (4.20)	$ (1.11)	$ (1.79)	$ 2.07	$ (5.21)	$ 3.79	$ (20.88)	$ (1.12)	$ 18.05
Diluted earnings per share	$ (14.65)	$ (0.79)	$ (4.20)	$ (1.11)	$ (1.79)	$ 2.05	$ (5.21)	$ 3.75	$ (20.88)	$ (1.12)	$ 17.85