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Financial Risk Management - Summary of Funding Programs (Detail) - 12 months ended Dec. 31, 2024 kr in Millions, $ in Millions	USD ($)	SEK (kr)
Euro Medium Term Note Program [member]
Disclosure Of Funding Programs [Line Items]
Amount | $	$ 5,000
Utilized | $	2,178
Unutilized | $	$ 2,822
Commercial Paper Program [Member]
Disclosure Of Funding Programs [Line Items]
Amount | kr		kr 10,000
Utilized | kr		1,615
Unutilized | kr		kr 8,385

X

- Definition

Disclosure of funding programs.

+ References

No definition available.

+ Details

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Namespace Prefix:	eric_
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Balance Type:	na
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X

- Definition

Funding program amount.

+ References

No definition available.

+ Details

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

X

- Definition

Funding program unutilized amount.

+ References

No definition available.

+ Details

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

X

- Definition

Funding program utilized amount.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=eric_CommercialPaperProgramMember
Namespace Prefix:
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Balance Type:
Period Type: