Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plans, Defined Benefit - Existing Veoneer Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 3	$ 4
Interest cost	1	0	2	1
Expected return on plan assets	(1)	(1)	(2)	(1)
Net periodic benefit cost	$ 1	$ 0	$ 3	$ 4