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Financial Risk Management - Summary of Net Exposure for Largest Currencies Impact on Sales (Detail) kr in Billions | 12 Months Ended
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Dec. 31, 2020 SEK (kr)
USD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | kr 76.7
Sales transaction exposure | 36.4
Sales net exposure | 113.1
Net external transaction exposure | (12.3)
Net internal transaction exposure | 39.6
EUR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 26.0
Sales transaction exposure | 9.5
Sales net exposure | 35.5
Net external transaction exposure | 12.5
Net internal transaction exposure | (6.4)
CNY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 15.3
Sales transaction exposure | (0.1)
Sales net exposure | 15.2
Net external transaction exposure | 3.0
Net internal transaction exposure | (8.8)
INR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.0
Sales transaction exposure | (0.2)
Sales net exposure | 6.8
Net external transaction exposure | 0.2
Net internal transaction exposure | (3.3)
AUD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 9.0
Sales transaction exposure | (0.5)
Sales net exposure | 8.5
Net external transaction exposure | 0.2
Net internal transaction exposure | 4.3
JPY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 11.8
Sales transaction exposure | 0.0
Sales net exposure | 11.8
Net external transaction exposure | 0.1
Net internal transaction exposure | 9.1
BRL [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 2.9
Sales transaction exposure | 0.0
Sales net exposure | 2.9
Net external transaction exposure | 1.0
Net internal transaction exposure | (0.5)
SAR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.0
Sales transaction exposure | 1.5
Sales net exposure | 8.5
Net external transaction exposure | 1.6
Net internal transaction exposure | 2.0
GBP [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 6.1
Sales transaction exposure | (0.7)
Sales net exposure | 5.4
Net external transaction exposure | (1.0)
Net internal transaction exposure | kr 2.2

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- Definition Currency gain (loss) due to changes in foreign exchange rates. + References No definition available. + Details
Name: | eric_CurrencyGainLossDueToChangesInForeignExchangeRates
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of Currency Exposure [line items] + References No definition available. + Details
Name: | eric_DisclosureOfCurrencyExposureLineItems
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase (decrease) in net debt through foreign currency exchange exposures. + References No definition available. + Details
Name: | eric_IncreaseDecreaseInNetDebtThroughForeignCurrencyExchangeExposures
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest expense interest income and net foreign exchange gain losses incurred. + References No definition available. + Details
Name: | eric_InterestExpenseInterestIncomeAndNetForeignExchangeGainLossesIncurred
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net sales exposure. + References No definition available. + Details
Name: | eric_NetSalesExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sales translation exposure. + References No definition available. + Details
Name: | eric_SalesTranslationExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_CNY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_INR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_JPY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_BRL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_SAR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |