Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plans, Defined Benefit - Existing Veoneer Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	1	1	1	1
Expected return on plan assets		(1)	(1)	(1)
Net periodic benefit cost	$ 2	$ 1	$ 2	$ 2