Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) segments $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Summary Of Significant Accounting Policies [Line Items]
Number of Reportable Segments | segments			4
Net cash used by operating activities			$ (3,416)	$ (18,410)	$ (2,446)
Debt Instrument, Face Amount	$ 9,800	$ 9,825	9,800
Debt repayments			15,371	10,998	12,171
Cash, Cash Equivalents, and Short-term Investments	16,200		16,200
Debt and Lease Obligation	58,102		58,102	63,583
Proceeds from Income Tax Refunds			1,700
Increase/(Decrease) in Revenue due to change in accounting estimate			(379)	(359)	54
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.			$ (880)	$ (942)	$ (111)
Earnings Per Share impact, change in accounting estimate | $ / shares			$ (1.28)	$ (1.37)	$ (0.06)
Reinsurance revenues			$ 126	$ 129	$ 151
Reinsurance costs			129	136	150
Research and development expense, net			2,249	2,476	3,219
Accounts payable	9,261		9,261	12,928
364-day Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,100		$ 3,100
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%
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)			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)			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
Bank Overdrafts [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable	$ 47		$ 47	74
Bid And Proposal Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Research and development expense, net			213	224	$ 214
Delayed Draw Term Loan Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt repayments	4,000	$ 9,825	13,800
Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	14,700		14,700
Line of Credit Facility, Maximum Borrowing Capacity	14,740		14,740
364-day Revolving Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,060		3,060
Supply Chain Financing [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts Payable, Trade	2,300		2,300	$ 3,800
Senior Notes [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt repayments			1,500
Senior Notes [Member] | 2022
Summary Of Significant Accounting Policies [Line Items]
Long-term Debt, Current Maturities	$ 1,200		$ 1,200