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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
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Disclosure of defined benefit plans [abstract] |  |
Effect of asset ceiling | kr 755 | kr 584

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- 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