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Share Based Compensation - Summary of Stock Purchase Plans (Detail) - Stock Purchase plan 2016 [member] | 12 Months Ended
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Dec. 31, 2020 Employee
Disclosure of Detailed Information About Stock Purchase Plans [Line items] |
Contribution period | August 2016-July 2017
Number of participants at launch | 31,500
Take-up rate – percent of eligible employees | 29.00%

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- Definition Contribution period of stock purchase plans. + 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 Disclosure of detailed information about stock purchase plans. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
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- Definition Number of participants of stock purchase plan. + References No definition available. + Details
Name: | eric_NumberOfParticipantsOfStockPurchasePlan
Namespace Prefix: | eric_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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

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