Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plans, Defined Benefit - Existing Veoneer Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Net periodic benefit cost	$ 1	$ 1