Restructuring- Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) employee	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve
Restructuring expense	$ 20	$ 14	$ 72	$ 41
Corporate
Restructuring Cost and Reserve
Restructuring expense				3
Engine
Restructuring Cost and Reserve
Restructuring and related cost, number of positions eliminated (employees) | employee			200
Drivetrain
Restructuring Cost and Reserve
Restructuring and related cost, number of positions eliminated (employees) | employee			350
Voluntary employee severance | Engine
Restructuring Cost and Reserve
Restructuring expense	15	10	$ 40	18
Termination benefit | Engine
Restructuring Cost and Reserve
Restructuring expense			3
Termination benefit | Drivetrain
Restructuring Cost and Reserve
Restructuring expense			19
Professional fees and employee termination benefits | Engine
Restructuring Cost and Reserve
Restructuring expense		$ 3		$ 14
Severance costs and professional fees | Drivetrain
Restructuring Cost and Reserve
Restructuring expense	$ 3		$ 8