Segment and Revenue Information (Schedule Of Revenue from External Customers Attributed to Foreign Countries by Geographic Area) (Details) - USD ($) $ 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
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 15,304	$ 14,139	$ 11,807	$ 16,908	$ 17,911	$ 19,980	$ 15,751	$ 22,917	$ 58,158	$ 76,559	$ 101,127
Percentage Of Operating Assets Located Outside United States									4.00%	4.00%
Operating Segments [Member] | B-737-Max [Member] | Customer Concessions [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 128	$ 151	$ 551		$ 2,619		$ 5,610
Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 16,162	$ 32,255	$ 57,499
Operating Segments [Member] | Commercial Airplanes | Fixed-price Contract [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									100.00%	100.00%	100.00%
Operating Segments [Member] | Commercial Airplanes | Transferred at Point in Time [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									100.00%	100.00%	100.00%
Operating Segments [Member] | Commercial Airplanes | External Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 16,112	$ 31,903	$ 57,469
Operating Segments [Member] | Commercial Airplanes | B-737-Max [Member] | Customer Concessions [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									(498)	(8,259)
Non-U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									21,677	42,137	56,451
Non-U.S. | Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									8,711	27,486	42,122
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									7,961	10,366	12,976
Europe | Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									3,872	5,829	9,719
Asia, Other Than China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									4,128	10,662	12,141
Asia, Other Than China | Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,408	7,395	8,274
Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									5,308	9,272	9,745
Middle East | Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,647	5,761	5,876
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,803	5,684	13,764
China | Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,271	5,051	13,068
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,302	2,019	2,583
Oceania
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									832	2,006	2,298
Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									114	1,113	1,486
Latin America, Caribbean And Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									229	1,015	1,458
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									36,979	42,681	44,676
United States | Operating Segments [Member] | Commercial Airplanes
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 7,899	$ 12,676	$ 15,347