Net Property and Lease Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net, by Type [Abstract]
Net property	$ 32,072	$ 30,163
Depreciation, Depletion and Amortization [Abstract]
Depreciation and other amortization	2,130	2,049	$ 2,127
Tooling amortization	2,563	2,304	2,160
Depreciation And Amortization, Property Related	4,693	4,353	4,287
Maintenance and rearrangement	1,801	1,656	1,543
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	216	228
Liabilities settled	(2)	(6)
Revisions to estimates	(28)	(6)
Ending balance	186	216	228
Operating Leases, Future Minimum Payments Due [Abstract]
Operating lease commitments, due in next twelve months	342
Operating lease commitments, due in two years	275
Operating lease commitments, due in three years	202
Operating lease commitments, due in four years	137
Operating lease commitments, due in five years	88
Operating lease commitments, due thereafter	340
Operating lease commitments, due total	1,384
Operating Leases, Rent Expense, Net [Abstract]
Operating Lease Expense	474	460	$ 524
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	391	344
Buildings and land improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	$ 10,308	9,983
Machinery, equipment, and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	14 years 6 months
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	$ 34,149	33,191
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	$ 2,803	2,598
Construction in progress
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	2,170	1,804
Total land, plant and equipment, and other
Property, Plant and Equipment, Net, by Type [Abstract]
Gross property	49,821	47,920
Accumulated depreciation	(27,804)	(27,803)
Net property	22,017	20,117
Tooling, net of amortization
Property, Plant and Equipment, Net, by Type [Abstract]
Net property	$ 10,055	$ 10,046
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	36 years
Land Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	36 years