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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, 2023 | Dec. 31, 2022
Disclosure Of Customer Finance Reconciliation [Abstract] |  |
Opening balance | kr 5,370 | kr 3,287
Additions | 49,583 | 37,295
Disposals/repayments | (47,409) | (35,412)
Revaluation | (467) | (151)
Translation difference | (160) | 351
Closing balance | 6,917 | 5,370
Of which non-current | kr 1,347 | kr 415

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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
Name: | eric_FairValueReconciliationOfCustomerFinance
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- 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