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Business Combinations - Summary of Business Divestments Transactions (Detail) | 12 Months Ended
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Dec. 31, 2021
MediaKind [member] |
Disclosure Of Business Divestitures [Line Items] |
Divestments, Company | MediaKind
Divestments, Description | A divestment of 51% of its MediaKind business.
Business Divestments, transaction date | FEB 1,2019
Data Center [Member] |
Disclosure Of Business Divestitures [Line Items] |
Divestments, Company | Data center
Divestments, Description | A data center business located in the Netherlands.
Business Divestments, transaction date | NOV 1, 2021

X
- Definition Date of divestments. + References No definition available. + Details
Name: | eric_DateOfDivestments
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of divestments. + References No definition available. + Details
Name: | eric_DescriptionOfDivestments
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of detailed information on business divestitures. + References No definition available. + Details
Name: | eric_DisclosureOfBusinessDivestituresLineItems
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Name of business sold. + References No definition available. + Details
Name: | eric_NameOfBusinessSold
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=eric_MediaKindMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=eric_DataCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |