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Employee Information - Summary of Remuneration to Board Members and Presidents in Subsidiaries (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Number And Average Number Of Employees [Abstract] |  |
Salary and other remuneration | kr 458 | kr 369
Of which annual variable remuneration | 58 | 83
Pension costs | kr 32 | kr 25

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- Definition Annual variable remuneration to board members and presidents. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Remuneration to board members and presidents in subsidiaries of pension costs. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Salary and other remuneration. + References No definition available. + Details
Name: | eric_SalaryAndOtherRemuneration
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration