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Property (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 60,334	$ 53,269
Less: accumulated depreciation	(24,081)	(20,666)
Total property, net	36,253	32,603
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	11,967	9,686	$ 6,753
Property, Plant and Equipment [Member]
Capitalized Interest and Software [Abstract]
Capitalized Software, Net	1,200	1,100
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	4,966	4,622	3,904
Impairment charges	199	68	628
Capitalized software amortization expense	459	458	$ 374
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	1,647	1,587
Buildings and Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 7,471	6,217
Buildings and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	5 years
Buildings and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	40 years
Machinery and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 23,915	21,613
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	27 years
Special Tools [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 21,113	19,359
Special Tools [Member] | Minimum [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	1 year
Special Tools [Member] | Maximum [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	13 years
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 6,188	$ 4,493

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of expense for amortization of capitalized computer software costs.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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