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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
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of performance obligations [abstract]
Revenue recognized relating to the opening contract liability balance	kr 23,980	kr 32,874
Revenue recognized relating to performance obligations satisfied, or partially satisfied, in prior reporting periods	138	134
Aggregate amount of transaction price allocated to unsatisfied, or partially unsatisfied, performance obligations	kr 134,199	kr 133,247

X

- Definition

Revenue recognized relating to performance obligations satisfied or partially satisfied in prior reporting periods.

+ References

No definition available.

+ Details

Name:	eric_RevenueRecognizedRelatingToPerformanceObligationsSatisfiedOrPartiallySatisfiedInPriorReportingPeriods
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfPerformanceObligationsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 2024-01-01
-Paragraph 116
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_RevenueThatWasIncludedInContractLiabilityBalanceAtBeginningOfPeriod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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 [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 120
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant