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v3.22.1

Customer Contract Related Balances - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended |
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items] |  |
Customer finance credits current | kr 2,719 | kr 1,916
2022 [member] |  |
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items] |  |
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue | 70.00% |
2023 [member] |  |
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items] |  |
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue | 20.00% |
2024 and beyond [member] |  |
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items] |  |
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue | 10.00% |

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- Definition Customer finance current. + References No definition available. + Details
Name: | eric_CustomerFinanceCurrent
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of receivables customer finance contract assets and contract liabilities + References No definition available. + Details
Name: | eric_DisclosureOfReceivablesCustomerFinanceContractAssetsAndContractLiabilitiesLineItems
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of entity which expects transaction price allocated to remaining performance obligation will converted to revenue. + References No definition available. + Details
Name: | eric_PercentageOfEntityWhichExpectsTransactionPriceAllocatedToRemainingPerformanceObligationWillConvertedToRevenue
Namespace Prefix: | eric_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=eric_LaterThanTwoYearAndBeyondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |