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Property (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 65,455	$ 67,449
Less: accumulated depreciation	(27,823)	(28,699)
Total property, net	37,632	38,750
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	12,676	14,060	$ 13,142
Property, Plant and Equipment
Capitalized Interest and Software [Abstract]
Capitalized software	1,300	1,300
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	5,354	6,541	5,347
Impairment charges	86	7	466
Capitalized software amortization expense	457	452	$ 424
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	1,339	1,302
Buildings and Improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 9,671	9,705
Buildings and Improvements | Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	5 years
Buildings and Improvements | Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	40 years
Machinery and Equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 30,013	29,814
Machinery and Equipment | Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	3 years
Machinery and Equipment | Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	27 years
Special Tools
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 20,851	23,586
Special Tools | Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	1 year
Special Tools | Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	13 years
Construction in Progress
Property, Plant and Equipment, Net, by Type [Abstract]
Total property	$ 3,581	$ 3,042

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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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