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Financial Risk Management - Summary of Committed Credit Facilities (Detail) - 12 months ended Dec. 31, 2020 € in Millions, $ in Millions | USD ($) | EUR (€)
--- | --- | ---
Multi-currency revolving credit facility [member] |  |
Disclosure Of Line Of Credit Facility [Line Items] |  |
Amount | $ | $ 2,000 |
Utilized | $ | 0 |
Unutilized | $ | $ 2,000 |
European Investment Bank credit facility [member] |  |
Disclosure Of Line Of Credit Facility [Line Items] |  |
Amount | € |  | € 250
Utilized | € |  | 0
Unutilized | € |  | € 250

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: |

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