Loss per share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic and diluted:
Net loss attributable to Veoneer	$ (133)	$ (63)	$ (270)	$ (95)
Denominator:
Basic: Weighted average number of shares outstanding (in millions) (in shares)	96,060	87,130	91,680	87,130
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions) (in shares)	96,060	87,130	91,680	87,130
Basic loss per share (in dollars per share)	$ (1.39)	$ (0.72)	$ (2.94)	$ (1.09)
Diluted loss per share (in dollars per share)	$ (1.39)	$ (0.72)	$ (2.94)	$ (1.09)