Schedule of Number Restricted Stock Units and Performance Shares (Parenthetical) (Detail)	Dec. 31, 2018 ConversionFactor
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted average grant date fair value after applying the conversion factor	100.74

Conversion factor weighted average grant date fair value.

No definition available.

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Namespace Prefix:	alv_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant