Stock Incentive Plan - Narrative (Details) - USD ($)				6 Months Ended	12 Months Ended
	Jun. 29, 2018	Feb. 13, 2018	Feb. 19, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 5,000,000	$ 2,000,000	$ 3,000,000
Options granted in the period (in shares)					0	0	0
Compensation cost not yet recognized, stock options				$ 0	$ 0
Share price (in dollars per share)				$ 23.57	$ 23.57
Intrinsic value of outstanding stock options				$ 1,000,000	$ 1,000,000
2018 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant of common stock for future equity awards (in shares)	3,000,000
Number of shares used for conversion of outstanding grants (in shares)	957,388
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 0
Expiration period					10 years
Requisite service period					1 year
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value		$ 6,000,000			$ 2,000,000
Grant date fair value (in dollars per share)					$ 42.88	$ 31.98	$ 29.81
Awards granted in the period (in shares)				9,380,000,000
Awards outstanding (in shares)				593,994,000,000	593,994,000,000			601,740,000,000
PSs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value			$ 3,000,000
Grant date fair value (in dollars per share)						$ 31.98	$ 29.81
Awards granted in the period (in shares)					0
Awards outstanding (in shares)				0	0
RSUs and PSs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized				$ 6,000,000	$ 6,000,000
Period of recognition					1 year 9 months 20 days
Spin-Off
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of stock options prior to Spin-Off transaction to be continued to be applicable to Autoliv common stock	50.00%
Percentage of pre-spin value of stock options to be replaced with options to acquire shares of Veoneer common stock	50.00%
Percentage of RSUs prior to Spin-Off to be continued to applicable to Autoliv common stock	50.00%
Percentage of pre-spin value of RSUs to be replaced with RSUs with underlying Veoneer common stock	50.00%
Estimated target performance level	100.00%
Period prior to Spin-Off for average of Autoliv closing stock prices used for conversion of RSUs and SOs	5 days
Period after Spin-Off for average of closing stock prices of Autoliv and Veoneer used for conversion of RSUs and SOs	5 days