Summary Of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Summary Of Significant Accounting Policies [Line Items]
Accounts Payable, Current	$ 10,667	$ 9,498
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.	100	242	379
Duration of operating cycle	generally longer than one year
Earnings Per Share impact, change in accounting estimate	$ 0.10	$ 0.23	$ 0.33
Reinsurance revenues	135	160	129
Reinsurance costs	144	147	128
Research and development expense	3,047	3,071	3,298
Repurchase commitments, maturities	generally 10 to 15 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Bank Overdrafts [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts Payable, Current	241	108
Commercial Airplanes [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.				(238)
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]
Summary Of Significant Accounting Policies [Line Items]
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.				(187)
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	12 months
Developed Technology [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)	5 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)	5 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)	19 years
Distribution Rights [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived acquired intangible assets, useful lives (in years)	5 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)	3 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)	3 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	289	285	326
KC-46A Tanker [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.				$ (425)