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Assets Pledged as Collateral - Summary of Assets Pledged as Collateral (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Assets Pledged As Collateral [Abstract] |  |  |
Chattel mortgages | [1] | kr 6,341 | kr 6,332
Bank deposits | [2] | 532 | 476
Total |  | kr 6,873 | kr 6,808
[1] | See also note G1 “Post-employment benefits.”
[2] | See also note F1 “Financial risk management.”

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- Definition Assets pledged as collateral for bank deposits. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Assets pledged as collateral for chattel mortgages. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure assets pledged as collateral. + References No definition available. + Details
Name: | eric_DisclosureAssetsPledgedAsCollateralAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_14_a&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant