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Financial Risk Management - Summary of Movements in Allowances for Impairment of Trade Receivables and Contract Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Trade And Other Receivables [Abstract] |  |
Opening balance | kr 2,983 | kr 4,123
Decrease in allowance | (118) | (737)
Write-offs | (136) | (382)
Translation difference | (211) | (21)
Closing balance | kr 2,518 | kr 2,983

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- Definition Allowance ​for​ impairment​ of trade​ receivables and contract assets​ write​ off. + References No definition available. + Details
Name: | eric_AllowanceForImpairmentOfTradeReceivablesAndContractAssetsWriteOff
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Opening ​balance​ of trade ​receivables and contract assets​ allowance ​for impairment. + References No definition available. + Details
Name: | eric_OpeningBalanceOfTradeReceivablesAndContractAssetsAllowanceForImpairment
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Trade ​receivables and contract assets ​allowance​ for ​impairment. + References No definition available. + Details
Name: | eric_TradeReceivablesAndContractAssetsAllowanceForImpairment
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Trade ​receivables and contract assets ​translation ​difference ​for​ allowance ​for​ impairment. + References No definition available. + Details
Name: | eric_TradeReceivablesAndContractAssetsTranslationDifferenceForAllowanceForImpairment
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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