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Financial Income and Expenses - Summary of Financial Income and Expenses (Parenthetical) (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Detailed Information About Finance Income Expense [Abstract]
Net gain from revaluation of customer finance receivables	kr 6
Net loss from revaluation of customer finance receivables		kr 209	kr 15
Net loss on revaluation of investments in shares and participations	kr 202	kr 186	kr 205

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- Definition

Disclosure of detailed information about finance income (expense).

+ References

No definition available.

+ Details

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- Definition

Net gain from revaluation of customer finance receivables.

+ References

No definition available.

+ Details

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

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- Definition

Net loss from revaluation of customer finance receivables.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Net loss on revaluation of investments in shares and participations.

+ References

No definition available.

+ Details

Name:	eric_NetLossOnrevaluationofinvestmentsinsharesandparticipations
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
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