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Customer Contract Related Balances - Summary of Significant Movements in Contract Assets and Liabilities (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of performance obligations [abstract] |  |
Revenue recognized in the year relating to the opening contract liability balance | kr 19,745 | kr 20,563
Revenue recognized relating to performance obligations satisﬁed, or partially satisfied, in prior reporting periods | (186) | 458
Aggregate amount of transaction price allocated to unsatisﬁed, or partially unsatisﬁed, performance obligations | kr 138,234 | kr 93,934

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- Definition Revenue recognized relating to performance obligations satisfied or partially satisfied in prior reporting periods. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 116 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_116_b&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2021-01-01 -Paragraph 120 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_120_a&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant