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Financial Risk Management - Summary of Committed Credit Facilities (Detail) - Multi-currency revolving credit facility [member] kr in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 SEK (kr)
Disclosure Of Line Of Credit Facility [Line Items] |  |  |
Amount | $ 2,000 | $ 2,000 |
Utilized | kr |  |  | kr 0
Unutilized |  | $ 2,000 |

X
- Definition Committed credit facilities, amount. + References No definition available. + Details
Name: | eric_CommittedCreditFacilitiesAmount
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Committed credit facilities, unutilized. + References No definition available. + Details
Name: | eric_CommittedCreditFacilitiesUnutilized
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Committed credit facilities, utilized. + References No definition available. + Details
Name: | eric_CommittedCreditFacilitiesUtilized
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Disclosure of line of credit facility table line items. + References No definition available. + Details
Name: | eric_DisclosureOfLineOfCreditFacilityLineItems
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | eric_CreditFacility1Axis=eric_MulticurrencyRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |