Segment and Revenue Information (Schedule Of Capital Expenditures By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Capital expenditures	$ 1,303	$ 1,834	$ 1,722
Operating Segments [Member] | Commercial Airplanes
Segment Reporting Information [Line Items]
Capital expenditures	322	433	604
Operating Segments [Member] | Defense, Space & Security
Segment Reporting Information [Line Items]
Capital expenditures	172	189	201
Operating Segments [Member] | Global Services
Segment Reporting Information [Line Items]
Capital expenditures	127	218	231
Corporate Reconciling Items And Eliminations [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 682	$ 994	$ 686