Investments (Schedule Of Ownership Percentages And Balances Of Equity Method Investments) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity method investments	[1]	$ 1,031	$ 1,048
Defense, Space & Security | United Launch Alliance [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%	50.00%
Equity method investments		$ 771	$ 768
Commercial Airplanes, Defense, Space & Security, and Global Services [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 260	$ 280

[1] ⁽¹⁾  Dividends received were $164 and $325 during 2019 and 2018. Retained earnings at December 31, 2019 include undistributed earnings from our equity method investments of $156.