Loss per share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic and diluted:
Net loss attributable to Veoneer	$ (233)	$ (137)
Denominator:
Basic: Weighted average number of shares outstanding (in millions) (in shares)	111,470	87,240
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions) (in shares)	111,470	87,240
Basic loss per share (in dollars per share)	$ (2.09)	$ (1.57)
Diluted loss per share (in dollars per share)	$ (2.09)	$ (1.57)