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Business Combinations - Summary of Business Divestments Transactions (Parenthetical) (Detail) | 1 Months Ended
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Feb. 28, 2019
Divestments 2018-2020 [member] | MediaKind [member] |
Disclosure Of Business Divestitures [Line Items] |
Percentage of business divested | 51.00%

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- Definition Disclosure of detailed information on business divestitures. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of business divested. + References No definition available. + Details
Name: | eric_PercentageOfBusinessDivested
Namespace Prefix: | eric_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=eric_DivestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=eric_MediaKindMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |