Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Percentage of estimated target performance level.

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Percentage of pre-spin value of restricted stock units to be replaced with restricted stock units with underlying common stock.

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Percentage of pre-spin value of stock options to be replaced with options to acquire shares of common stock.

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Percentage of restricted stock units prior to spin-off transaction to be continued to be applicable to parent common stock.

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Percentage of stock options prior to spin-off transaction to be continued to be applicable to parent common stock.

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Period after spin-off for average of closing stock prices of parent and entity used for conversion of restricted stock units and stock options.

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Period prior to spin-off for average of parent closing stock prices used for conversion of restricted stock units and stock options.

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Share-based compensation arrangement by share-based payment award, number of shares used for conversion of outstanding grants.

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Stock Incentive Plan - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
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	3,000,000
Number of shares used for conversion of outstanding grants	1,000,000
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				$ 0
RSUs and PSs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 1,000,000	$ 1,000,000	$ 2,000,000	$ 2,000,000
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
Spin-Off \| 2018 Stock Incentive Plan \| Autoliv \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares authorized to be used for conversion of outstanding Autoliv stock awards	1,500,000