Segment and Revenue Information Segment and Revenue Information (Schedule of Revenue Disaggregation) (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
Disaggregation of Revenue [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
Europe
Disaggregation of Revenue [Line Items]
Revenues									7,961	10,366	12,976
Middle East
Disaggregation of Revenue [Line Items]
Revenues									5,308	9,272	9,745
Asia, Other Than China
Disaggregation of Revenue [Line Items]
Revenues									4,128	10,662	12,141
China
Disaggregation of Revenue [Line Items]
Revenues									1,803	5,684	13,764
Non-U.S.
Disaggregation of Revenue [Line Items]
Revenues									21,677	42,137	56,451
United States
Disaggregation of Revenue [Line Items]
Revenues									36,979	42,681	44,676
Operating Segments [Member] | B-737-Max [Member] | Customer Concessions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 128	$ 151	$ 551		$ 2,619		$ 5,610
Operating Segments [Member] | Commercial Airplanes
Disaggregation of Revenue [Line Items]
Revenues									16,162	32,255	57,499
Operating Segments [Member] | Commercial Airplanes | B-737-Max [Member] | Customer Concessions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									(498)	(8,259)
Operating Segments [Member] | Commercial Airplanes | External Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 16,112	$ 31,903	$ 57,469
Operating Segments [Member] | Commercial Airplanes | Fixed-price Contract [Member]
Disaggregation of Revenue [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]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									100.00%	100.00%	100.00%
Operating Segments [Member] | Commercial Airplanes | Europe
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 3,872	$ 5,829	$ 9,719
Operating Segments [Member] | Commercial Airplanes | Middle East
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,647	5,761	5,876
Operating Segments [Member] | Commercial Airplanes | Asia, Other Than China
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,408	7,395	8,274
Operating Segments [Member] | Commercial Airplanes | China
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,271	5,051	13,068
Operating Segments [Member] | Commercial Airplanes | Other
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									513	3,450	5,185
Operating Segments [Member] | Commercial Airplanes | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									8,711	27,486	42,122
Operating Segments [Member] | Commercial Airplanes | United States
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									7,899	12,676	15,347
Operating Segments [Member] | Defense, Space & Security
Disaggregation of Revenue [Line Items]
Revenues									$ 26,257	$ 26,095	$ 26,300
Operating Segments [Member] | Defense, Space & Security | U.S. Government Contracts
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									89.00%	89.00%	88.00%
Operating Segments [Member] | Defense, Space & Security | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									98.00%	98.00%	98.00%
Operating Segments [Member] | Defense, Space & Security | Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									69.00%	70.00%	70.00%
Operating Segments [Member] | Defense, Space & Security | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 6,595	$ 6,630	$ 6,812
Operating Segments [Member] | Defense, Space & Security | United States
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									19,662	19,465	19,488
Operating Segments [Member] | Global Services
Disaggregation of Revenue [Line Items]
Revenues									15,543	18,468	17,056
Operating Segments [Member] | Global Services | Commercial Customers
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									6,936	10,167	9,227
Operating Segments [Member] | Global Services | Government Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 8,368	$ 8,107	$ 7,658
Operating Segments [Member] | Global Services | U.S. Government Contracts
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									41.00%	34.00%	36.00%
Operating Segments [Member] | Global Services | External Customers [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 15,304	$ 18,274	$ 16,885
Operating Segments [Member] | Global Services | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									47.00%	55.00%	54.00%
Operating Segments [Member] | Global Services | Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, excluding assessed tax, Percentage									87.00%	90.00%	90.00%
Intersegment Eliminations [Member] | Commercial Airplanes
Disaggregation of Revenue [Line Items]
Revenues									$ 50	$ 352	$ 30
Intersegment Eliminations [Member] | Global Services
Disaggregation of Revenue [Line Items]
Revenues									$ 239	$ 194	$ 171