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Financial Risk Management - Summary of Outstanding Customer Finance Credit Exposure (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Outstanding Customer Finance [Abstract] |  |
Fair value of customer ﬁnance credits | kr 3,287 | kr 3,137
Financial guarantees for third-parties | 6 | 5
Accrued interest | 9 | 8
Maximum exposure to credit risk | 3,302 | 3,150
Less third-party risk coverage | (94) | (95)
The Company's risk exposure, less third-party risk coverage | kr 3,208 | kr 3,055

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- Definition Customer finance accrued interest. + References No definition available. + Details
Name: | eric_CustomerFinanceAccruedInterest
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Customer finance credits financial guarantees for third parties. + References No definition available. + Details
Name: | eric_CustomerFinanceCreditsFinancialGuaranteesForThirdParties
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Customer finance credits net of third party risk coverage. + References No definition available. + Details
Name: | eric_CustomerFinanceCreditsNetOfThirdPartyRiskCoverage
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of outstanding customer finance [abstract] + References No definition available. + Details
Name: | eric_DisclosureOfOutstandingCustomerFinanceAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value of customer finance credits. + References No definition available. + Details
Name: | eric_FairValueOfCustomerFinanceCredits
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Third party risk coverage. + References No definition available. + Details
Name: | eric_ThirdPartyRiskCoverage
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2021-03-24 + Details
Name: | ifrs-full_MaximumExposureToCreditRisk
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant