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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, 2023 SEK (kr)
USD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | kr 81.7
Sales transaction exposure | 55.6
Sales net exposure | 137.3
Cost translation exposure | (62.2)
Cost transaction exposure | (42.4)
Cost net exposure | (104.6)
EUR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 40.9
Sales transaction exposure | (0.5)
Sales net exposure | 40.4
Cost translation exposure | (37.3)
Cost transaction exposure | (2.6)
Cost net exposure | (39.9)
INR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 31.2
Sales transaction exposure | (0.7)
Sales net exposure | 30.5
Cost translation exposure | (19.9)
Cost transaction exposure | 0.2
Cost net exposure | (19.7)
JPY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 10.1
Sales transaction exposure | 0.0
Sales net exposure | 10.1
Cost translation exposure | (4.1)
Cost transaction exposure | 0.0
Cost net exposure | (4.1)
GBP [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 9.1
Sales transaction exposure | (1.0)
Sales net exposure | 8.1
Cost translation exposure | (3.6)
Cost transaction exposure | 0.0
Cost net exposure | (3.6)
CNY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.8
Sales transaction exposure | 0.0
Sales net exposure | 7.8
Cost translation exposure | (5.7)
Cost transaction exposure | 1.1
Cost net exposure | (4.6)
SAR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 5.6
Sales transaction exposure | 0.4
Sales net exposure | 6.0
Cost translation exposure | (3.5)
Cost transaction exposure | 0.1
Cost net exposure | (3.4)
BRL [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 5.0
Sales transaction exposure | 0.0
Sales net exposure | 5.0
Cost translation exposure | (4.1)
Cost transaction exposure | 1.2
Cost net exposure | kr (2.9)

X
- 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

X
- 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

X
- 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

X
- 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

X
- Definition Net cost exposure. + References No definition available. + Details
Name: | eric_NetCostExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

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

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

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

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

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

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

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

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