Net Property (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment, Net, by Type [Abstract]
Net property	$ 36,469	$ 36,178
Depreciation, Depletion and Amortization [Abstract]
Depreciation and other amortization	3,449	2,504	$ 2,292
Tooling amortization	(1,199)	(972)	(669)
Depreciation, Depletion, and Amortization, Including Impairment	6,858	5,413	4,987
Maintenance and rearrangement	$ 1,963	1,994	1,970
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	14 years 6 months
Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	8 years
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	$ 3,691	3,349
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	$ 421	445
Land Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	36 years
Building and Building Improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	$ 11,900	11,477
Other Machinery and Equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	38,939	38,720
Construction in progress
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	1,710	2,066
Total land, plant and equipment, and other
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	56,661	56,057
Accumulated depreciation	(31,020)	(30,243)
Net property	25,641	25,814
Tools, Dies and Molds
Property, Plant and Equipment, Net, by Type [Abstract]
Net property	10,828	10,364
Depreciation, Depletion and Amortization [Abstract]
Tooling amortization	$ 3,409	$ 2,909	$ 2,695
Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	36 years