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Assets Pledged as Collateral - Summary of Assets Pledged as Collateral (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Assets Pledged As Collateral [Abstract] |  |
Chattel mortgages | kr 6,332 | kr 5,340
Bank deposits | 476 | 561
Total | kr 6,808 | kr 5,901

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- Definition Assets pledged. + References No definition available. + Details
Name: | eric_AssetsPledged
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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