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Financial Risk Management - Summary of Movements in Allowances for Impairment of Trade Receivables and Contract Assets (Parenthetical) (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Trade And Other Receivables [Line Items] |  |  |
Contract assets | kr 2,518 | kr 2,983 | kr 4,123
Contract assets [member] |  |  |
Trade And Other Receivables [Line Items] |  |  |
Contract assets | kr 1 | kr 0 |

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- Definition Trade and Other Receivables [line items] + References No definition available. + Details
Name: | eric_TradeAndOtherReceivablesLineItems
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_ContractAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |