Schedule of Number Restricted Stock Units and Performance Shares (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value at grant date	[1]	$ 69.58		$ 76.85		$ 131.51
Outstanding at beginning of year		255,195	[2]	262,074	[2]	188,410
Granted		115,500		109,653		131,246
Shares issued		(105,750)		(86,086)		(84,425)
Cancelled/Forfeited/Expired		(20,044)		(30,446)		(6,485)
Spin conversion	[3]					33,328
Outstanding at end of year	[2]	244,901		255,195		262,074
Performance Shares
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value at grant date	[1]	$ 69.86		$ 77.00		$ 105.87
Outstanding at beginning of year		76,321				139,891
Change in performance conditions		23,998		12,530
Granted	[4]	75,940		66,542		588
Cancelled/Forfeited/Expired		(18,131)		(2,751)		(3,076)
Spin conversion	[5]					(137,403)
Outstanding at end of year		158,128		76,321

[1] Weighted average fair value at grant date pre spin-off in 2018.

[2] Outstanding at the end of 2018 reflects the RSUs held by employees of Autoliv and Veoneer, in accordance with the conversion factor described above. The corresponding weighted average grant date fair value after applying the conversion factor is $100.74 as of December 31, 2018.

[3] Reflects the impact of the cancellation of PS awards outstanding as of the Distribution Date, and the conversion to RSUs in accordance with the conversion factor described above.

[4] 2018 grants reflect awards issued pre-spin-off as a result of dividend equivalent rights.

[5] Reflects the replacement of awards due to the spin-off. Outstanding PS awards were converted to RSU awards in accordance with the conversion factor described above.