Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property Plant and Equipment
Total property, plant and equipment, gross	$ 4,165		$ 4,150
Less: accumulated depreciation	(1,500)		(1,473)
Property, plant and equipment, net, excluding tooling	2,665		2,677
Tooling, net of amortization	230		227
Property, plant and equipment, net	2,895		2,904
Capital Expenditures Incurred but Not yet Paid	84		104
Capitalized interest costs	5	$ 6
Land, land use rights and buildings [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	879		871
Machinery and equipment [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	2,889		2,851
Capital leases [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	2		2
Construction in progress [Member]
Property Plant and Equipment
Total property, plant and equipment, gross	$ 395		$ 426