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Employee Information - Summary of Remuneration to Board Members and Presidents in Subsidiaries (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Remuneration To Board Members And Presidents In Subsidiaries [Abstract]
Salary and other remuneration	kr 459	kr 477
Of which annual variable remuneration	109	90
Pension costs	kr 36	kr 34

X

- Definition

Annual variable remuneration to board members and presidents.

+ References

No definition available.

+ Details

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Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure of remuneration to board members and presidents in subsidiaries.

+ References

No definition available.

+ Details

Name:	eric_DisclosureOfRemunerationToBoardMembersAndPresidentsInSubsidiariesAbstract
Namespace Prefix:	eric_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Remuneration to board members and presidents in subsidiaries of pension costs.

+ References

No definition available.

+ Details

Name:	eric_RemunerationToBoardMembersAndPresidentsInSubsidiariesOfPensionCosts
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Salary and other remuneration.

+ References

No definition available.

+ Details

Name:	eric_SalaryAndOtherRemuneration
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration