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Financial Risk Management - Disclosure of Customer Finance Fair Value Reconciliation (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Customer Finance Reconciliation [Abstract] |  |
Opening balance | kr 3,756 | kr 2,884
Additions | 24,765 | 29,732
Disposals/repayments | (25,069) | (28,032)
Revaluation | (66) | (804)
Translation difference | (249) | (24)
Closing balance | 3,137 | 3,756
Of which non-current | kr 1,221 | kr 2,262

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- Definition Disclosure of customer finance reconciliation. + References No definition available. + Details
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- Definition Fair value reconciliation of customer finance. + References No definition available. + Details
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- Definition Fair value reconciliation of customer finance additions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Fair value reconciliation of customer finance disposals and repayments. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
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- Definition Fair value reconciliation of customer finance non current. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Fair value reconciliation of customer finance revaluation. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceRevaluation
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair value reconciliation of customer finance translation difference. + References No definition available. + Details
Name: | eric_FairValueReconciliationOfCustomerFinanceTranslationDifference
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration