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Assets Pledged as Collateral - Summary of Assets Pledged as Collateral (Detail) - SEK (kr) kr in Millions		Dec. 31, 2024	Dec. 31, 2023
Disclosure Assets Pledged As Collateral [Abstract]
Chattel mortgages	[1]	kr 7,697	kr 7,678
Bank deposits		1,443	547
Marketable securities		298	276
Total		kr 9,438	kr 8,501
[1] See also note G1 “Post-employment benefits.”

X

- Definition

Assets pledged as collateral for bank deposits.

+ References

No definition available.

+ Details

Name:	eric_AssetsPledgedAsCollateralForBankDeposits
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Assets pledged as collateral for chattel mortgages.

+ References

No definition available.

+ Details

Name:	eric_AssetsPledgedAsCollateralForChattelMortgages
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- Definition

Marketable security

+ References

No definition available.

+ Details

Name:	eric_MarketableSecurity
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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: Classes of contingent liabilities [domain]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 14
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant