Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) segments $ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares	Jan. 01, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of Reportable Segments | segments									4
Net earnings	$ 3,132	$ 1,853	$ 1,761	$ 1,451	$ 1,631	$ 2,279	$ (234)	$ 1,219	$ 8,197	$ 4,895	$ 5,176
Duration of operating cycle									generally longer than one year
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.									$ 14	$ (912)	$ (224)
Earnings Per Share impact, change in accounting estimate | $ / shares									$ 0.02	$ (1.25)	$ (0.23)
Reinsurance costs									$ 144	$ 139	$ 132
Reinsurance revenues									141	147	136
Research and development expense									3,179	4,627	$ 3,331
Accounts Payable, Current	$ 12,202				$ 11,190				$ 12,202	$ 11,190
Repurchase commitments, maturities									generally 10 to 15 years
Diluted earnings/(loss) per share | $ / shares	$ 5.18	$ 3.06	$ 2.89	$ 2.34	$ 2.59	$ 3.60	$ (0.37)	$ 1.83	$ 13.43	$ 7.61	$ 7.44
Net Cash Provided by (Used in) Operating Activities									$ 13,344	$ 10,499	$ 9,363
Net Cash Provided by (Used in) Financing Activities									(11,350)	(9,587)	(7,920)
Other income/(loss), net									129	40	(13)
Interest and Debt Expense									(360)	(306)	(275)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									10,047	5,568	7,155
Income Tax Expense (Benefit)									$ (1,850)	$ (673)	$ (1,979)
Income (Loss) from Continuing Operations, Per Diluted Share | $ / shares									$ 13.43	$ 7.61	$ 7.44
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, Current	$ 116				$ 77				$ 116	$ 77
Commercial Airplanes [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term									3 years
Commercial Airplanes [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term									4 years
Defense, Space & Security [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard warranty term									6 months
Defense, Space & Security [Member] | 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)									4 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)									3 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)									2 years
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
Bid And Proposal Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Research and development expense									$ 288	311	$ 286
KC-46A Tanker [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.		$ (329)		$ (142)	$ (312)		$ (573)	$ (243)	(471)	(1,128)	$ (835)
Pro Forma [Member]
Summary Of Significant Accounting Policies [Line Items]
Net earnings									8,458	5,034
Other income/(loss), net									123	(438)
Interest and Debt Expense									(360)	(306)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									10,107	5,783
Income Tax Expense (Benefit)									$ (1,649)	$ (749)
Income (Loss) from Continuing Operations, Per Diluted Share | $ / shares									$ 13.85	$ 7.83
Sales Revenue, Net [Member] | Pro Forma [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets												$ 10,000
Operating Income (Loss) [Member] | Pro Forma [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets												1,300
Retained Earnings [Member] | Pro Forma [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets												$ 900
Other Income [Member] | Pro Forma [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									$ (6)	$ (478)
Assets [Member] | Pro Forma [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification									$ 20,000	$ (19,000)