XML 249 R145.htm IDEA: XBRL DOCUMENT
v3.21.1

Financial Income and Expenses - Summary of Financial Income and Expenses (Parenthetical) (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Detailed Information About Finance Income Expense [Abstract] |  |  |
Gain related to partial settlement of pension plan liabilities | kr 93 | kr 258 |
Net loss from revaluation of customer finance receivables | kr 197 | kr 650 | kr 1,059

X
- Definition Disclosure of detailed information about finance income (expense). + References No definition available. + Details
Name: | eric_DisclosureOfDetailedInformationAboutFinanceIncomeExpenseAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gain related to partial settlement of pension plan liabilities. + References No definition available. + Details
Name: | eric_GainRelatedToPartialSettlementOfPensionPlanLiabilities
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net loss from revaluation of customer finance receivables. + References No definition available. + Details
Name: | eric_NetLossFromRevaluationOfCustomerFinanceReceivables
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration