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Contingent Liabilities - Additional Information (Detail) - Contingent liability for guarantees [member] - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Contingent Liabilities [Line Items] |  |
Guarantees of loans to other companies | kr 15 | kr 27
Financial guarantee for third parties | kr 6 | kr 24

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- Definition Financial guarantees for third parties. + References No definition available. + Details
Name: | eric_FinancialGuaranteesForThirdParties
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Guarantees of loans to other companies. + References No definition available. + Details
Name: | eric_GuaranteesOfLoansToOtherCompanies
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfContingentLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=ifrs-full_ContingentLiabilityForGuaranteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |