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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic and diluted:
Net loss attributable to Veoneer	$ (90)	$ (133)	$ (322)	$ (270)
Denominator:
Basic: Weighted average number of shares outstanding (in millions) (in shares)	111,580	96,060	111,520	91,680
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions) (in shares)	111,580	96,060	111,520	91,680
Basic loss per share (in dollars per share)	$ (0.80)	$ (1.39)	$ (2.89)	$ (2.94)
Diluted loss per share (in dollars per share)	$ (0.80)	$ (1.39)	$ (2.89)	$ (2.94)