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Post-Employment Benefits - Summary of Amount Recognized in the Consolidated Balance Sheet (Parenthetical) (Detail) - SEK (kr) kr in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of defined benefit plans [abstract]
Effect of asset ceiling	kr 755	kr 584

X

- Definition

Liability asset defined benefit plan asset ceiling.

+ References

No definition available.

+ Details

Name:	eric_LiabilityAssetDefinedBenefitPlanAssetCeiling
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDefinedBenefitPlansAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration