Loss per share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic and diluted:
Net loss attributable to Veoneer	$ (133)	$ (68)	$ (403)	$ (162)
Denominator:
Basic: Weighted average number of shares outstanding (in millions) (in shares)	111,400	87,150	98,320	87,150
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions) (in shares)	111,400	87,150	98,320	87,150
Basic loss per share (in dollars per share)	$ (1.20)	$ (0.78)	$ (4.10)	$ (1.86)
Diluted loss per share (in dollars per share)	$ (1.20)	$ (0.78)	$ (4.10)	$ (1.86)