Segment and Revenue Information (Schedule Of Capital Expenditures By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Capital expenditures	$ 1,722	$ 1,739	$ 2,613
Operating Segments [Member] | Commercial Airplanes
Segment Reporting Information [Line Items]
Capital expenditures	604	636	830
Operating Segments [Member] | Defense, Space & Security
Segment Reporting Information [Line Items]
Capital expenditures	208	210	290
Operating Segments [Member] | Global Services
Segment Reporting Information [Line Items]
Capital expenditures	231	180	209
Unallocated items, eliminations and other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 679	$ 713	$ 1,284