Loss per share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic and diluted:
Net loss attributable to Veoneer	$ (137)	$ (32)
Denominator:
Basic: Weighted average number of shares outstanding (in millions) (in shares)	87,240,000	87,130,000
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions) (in shares)	87,240,000	87,130,000
Basic loss per share (in dollars per share)	$ (1.57)	$ (0.36)
Diluted loss per share (in dollars per share)	$ (1.57)	$ (0.36)
Shares excluded from calculation (in shares)	321,619	0