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Financial Risk Management - Summary of Exposure of Trade Receivables and Contract Assets (Detail) - SEK (kr) kr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Exposure of trade receivables and contract assets Explanatory [Abstract]
Gross balance	kr 53,902	kr 52,799
Allowance for expected credit losses	(2,827)	(2,585)
Net balance and carrying value	kr 51,075	kr 50,214

X

- Definition

Change in exposure and carrying value to credit risk.

+ References

No definition available.

+ Details

Name:	eric_ChangeInExposureAndCarryingValueToCreditRisk
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Change in exposure to credit risk.

+ References

No definition available.

+ Details

Name:	eric_ChangeInExposureToCreditRisk
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Disclosure Of exposure of trade receivables and contract assets explanatory

+ References

No definition available.

+ Details

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

X

- Definition

Provisions for expected credit losses on trade receivables and contract assets.

+ References

No definition available.

+ Details

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