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Assets Pledged as Collateral - Summary of Assets Pledged as Collateral (Detail) - SEK (kr) kr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure Assets Pledged As Collateral [Abstract] |  |  |
Chattel mortgages | [1] | kr 7,678 | kr 6,333
Bank deposits | [2] | 547 | 604
Marketable securities | [2] | 276 | 289
Total |  | kr 8,501 | kr 7,226
[1] | See also note G1 “Post-employment benefits.”
[2] | As of 2023, “Marketable securities” which was previously disclosed under “Bank deposits” is now presented as a separate line and the comparative year has been adjusted accordingly.

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- Definition Assets pledged as collateral for bank deposits. + References No definition available. + Details
Name: | eric_AssetsPledgedAsCollateralForBankDeposits
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Assets pledged as collateral for chattel mortgages. + References No definition available. + Details
Name: | eric_AssetsPledgedAsCollateralForChattelMortgages
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure assets pledged as collateral. + References No definition available. + Details
Name: | eric_DisclosureAssetsPledgedAsCollateralAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Marketable securities. + References No definition available. + Details
Name: | eric_MarketableSecurities
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 14 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_14_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant