Segment Information (Schedule Of Capital Expenditures By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Capital expenditures	$ 1,739	$ 2,613	$ 2,450
Operating Segments [Member] | Commercial Airplanes [Member]
Segment Reporting Information [Line Items]
Capital expenditures	636	830	819
Operating Segments [Member] | Defense, Space & Security [Member]
Segment Reporting Information [Line Items]
Capital expenditures	210	290	226
Operating Segments [Member] | Global Services [Member]
Segment Reporting Information [Line Items]
Capital expenditures	180	209	132
Unallocated items, eliminations and other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 713	$ 1,284	$ 1,273