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Property (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 65,483	$ 60,334
Less: accumulated depreciation	(26,725)	(24,081)
Total property, net	38,758	36,253
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	13,142	11,967	$ 9,686
Property, Plant and Equipment [Member]
Capitalized Interest and Software [Abstract]
Capitalized Software, Net	1,100	1,200
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	5,347	4,966	4,622
Impairment charges	466	199	68
Capitalized software amortization expense	424	459	$ 458
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	1,349	1,647
Buildings and Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 9,173	7,471
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	$ 26,453	23,915
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	$ 23,828	21,113
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	$ 4,680	$ 6,188

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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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