XML 280 R176.htm IDEA: XBRL DOCUMENT
v3.21.1

Share Based Compensation - Summary of Shares for All Plans (Detail) - 2016 [member] shares in Millions, kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 SEK (kr) shares | Dec. 31, 2016 shares
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |
Originally designated |  | 21.6
Outstanding beginning | 10.9 |
Exercised/matched during 2020 | 10.8 |
Forfeited/expired during 2020 | 0.1 |
Compensation costs charged during 2020 (SEK million) | kr | kr 65.6 |

X
- Definition Number of share options exercised or matched in share based payment arrangement. + References No definition available. + Details
Name: | eric_NumberOfShareOptionsExercisedOrMatchedInShareBasedPaymentArrangement
Namespace Prefix: | eric_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of share options forfeited or expired in share based payment arrangement. + References No definition available. + Details
Name: | eric_NumberOfShareOptionsForfeitedOrExpiredInShareBasedPaymentArrangement
Namespace Prefix: | eric_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares originally designated. + References No definition available. + Details
Name: | eric_NumberOfSharesOriginallyDesignated
Namespace Prefix: | eric_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share options compensation cost recognized. + References No definition available. + Details
Name: | eric_ShareOptionsCompensationCostRecognized
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NumberOfOutstandingShareOptions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=eric_TwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |