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Trade Payables - Summary of Trade Payables (Parenthetical) (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Ericsson's supplier payments program [member] |  |
Trade And Other Receivables [Line Items] |  |
Trade payable relates to supplier invoices | kr 8.3 | kr 8.6

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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 payable relates to supplier invoices. + References No definition available. + Details
Name: | eric_TradePayableRelatesToSupplierInvoices
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=eric_EricssonSupplierPaymentsProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |