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v3.21.1

Employee Information - Summary of Board Members, Presidents and Group Management by Gender (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Women [member] | Parent [member] |  |
Disclosure of Information About Employees [line items] |  |
Board members and President | 23.00% | 23.00%
Group Management | 20.00% | 20.00%
Women [member] | Subsidiaries [member] |  |
Disclosure of Information About Employees [line items] |  |
Board members and President | 19.00% | 19.00%
Men [member] | Parent [member] |  |
Disclosure of Information About Employees [line items] |  |
Board members and President | 77.00% | 77.00%
Group Management | 80.00% | 80.00%
Men [member] | Subsidiaries [member] |  |
Disclosure of Information About Employees [line items] |  |
Board members and President | 81.00% | 81.00%

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- Definition Line items representing the information about employees. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of board members and president. + References No definition available. + Details
Name: | eric_PercentageOfBoardMembersAndPresident
Namespace Prefix: | eric_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of group management. + References No definition available. + Details
Name: | eric_PercentageOfGroupManagement
Namespace Prefix: | eric_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | eric_GenderTypeAxis=eric_WomenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | eric_GenderTypeAxis=eric_MenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |