Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 0
Interest cost			$ 0
Existing Veoneer Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 1		$ 4	$ 3
Interest cost	0	0		1	1
Expected return on plan assets	(1)	0		(2)	(1)
Net periodic benefit cost	$ 1	$ 1		$ 3	$ 3