Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) segments $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Operating Lease, Liability		$ 1,230								$ 1,230
Increase/(Decrease) in Revenue due to change in accounting estimate										$ 54	$ 137	$ 559
Number of Reportable Segments | segments										4
Net (loss)/earnings		(1,010)	$ 1,167	$ (2,942)	$ 2,149	$ 3,424	$ 2,363	$ 2,196	$ 2,477	$ (636)	10,460	8,458
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.										$ (111)	$ (190)	$ 250
Earnings Per Share impact, change in accounting estimate | $ / shares										$ (0.06)	$ (0.29)	$ 0.34
Reinsurance costs										$ 150	$ 136	$ 144
Reinsurance revenues										151	145	141
Research and development expense, net										3,219	3,269	$ 3,179
Accounts payable		$ 15,553				$ 12,916				$ 15,553	$ 12,916
Diluted earnings per share | $ / shares		$ (1.79)	$ 2.05	$ (5.21)	$ 3.75	$ 5.93	$ 4.07	$ 3.73	$ 4.15	$ (1.12)	$ 17.85	$ 13.85
Net cash (used)/provided by operating activities										$ (2,446)	$ 15,322	$ 13,346
Net cash provided/(used) by financing activities										5,739	(11,722)	(11,350)
Other income, net										438	92	123
Interest and debt expense										(722)	(475)	(360)
Earnings before income taxes										(2,259)	11,604	10,107
Income tax benefit/(expense)										1,623	(1,144)	$ (1,649)
Income (Loss) from Continuing Operations, Per Diluted Share | $ / shares												$ 13.85
Retained earnings		$ 50,644				$ 55,941				50,644	55,941
Accumulated Other Comprehensive Income (Loss), Net of Tax	[1]	$ (16,153)				(15,083)				$ (16,153)	(15,083)	$ (16,373)	$ (13,623)
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage		20.00%								20.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage		50.00%								50.00%
Bank Overdrafts [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable		$ 101				127				$ 101	127
Commercial Airplanes | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term										3 years
Commercial Airplanes | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term										4 years
Defense, Space & Security | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term										6 months
Defense, Space & Security | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term										2 years
Developed Technology [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										2 years
Developed Technology [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										14 years
Product Know-How [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										6 years
Product Know-How [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										30 years
Customer Base [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										3 years
Customer Base [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										17 years
Distribution Rights [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										3 years
Distribution Rights [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										27 years
Other Intangible Assets [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										1 year
Other Intangible Assets [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)										32 years
Buildings And Land Improvements [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives (in years)										10 years
Buildings And Land Improvements [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives (in years)										40 years
Machinery And Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives (in years)										4 years
Machinery And Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives (in years)										20 years
Capitalized Internal Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives (in years)										5 years
7372 Services, Prepackaged Software [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful lives (in years)										10 years
Bid And Proposal Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Research and development expense, net										$ 214	234	288
KC-46A Tanker [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.		(108)				$ (50)	$ (179)	$ (426)	$ (81)	(148)	(736)	(445)
Commercial Crew [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.		$ (410)								(489)
Unallocated items, eliminations and other
Summary Of Significant Accounting Policies [Line Items]
Research and development expense, net										$ 384	$ 132	$ (42)

[1] Net of tax.