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Customer Contract Related Balances - Additional Information (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]
Amortization Of Deferred Sales Commissions	kr 457	kr 288
2024 [member]
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue	65.00%
2025 [member]
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue	15.00%
2026 and beyond [member]
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue	20.00%

X

- Definition

Amortization of deferred sales commissions.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of receivables customer finance contract assets and contract liabilities

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of entity which expects transaction price allocated to remaining performance obligation will converted to revenue.

+ References

No definition available.

+ Details

Name:	eric_PercentageOfEntityWhichExpectsTransactionPriceAllocatedToRemainingPerformanceObligationWillConvertedToRevenue
Namespace Prefix:	eric_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=eric_LaterThanTwoYearAndBeyondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: