Restructuring- Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) facility employee	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve
Number of offices facilities closed (facility) | facility	2
Restructuring and related cost, number of positions eliminated (employees) | employee	550
Restructuring expense	$ 37	$ 13	$ 52	$ 27
Termination Benefit | Engine
Restructuring Cost and Reserve
Restructuring expense	3
Termination Benefit | Drivetrain
Restructuring Cost and Reserve
Restructuring expense	17
Severance And Professional Fees | Engine
Restructuring Cost and Reserve
Restructuring expense	7	4	12	11
Severance And Professional Fees | Drivetrain
Restructuring Cost and Reserve
Restructuring expense	3		5
Voluntary termination | Engine
Restructuring Cost and Reserve
Restructuring expense	$ 5	$ 7	$ 13	11
Corporate restructuring | Corporate
Restructuring Cost and Reserve
Restructuring expense				$ 3