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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, 2021 SEK (kr)
USD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | kr 78.9
Sales transaction exposure | 36.1
Sales net exposure | 115.0
Cost translation exposure | (45.2)
Cost transaction exposure | (53.0)
Cost net exposure | (98.2)
EUR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 28.3
Sales transaction exposure | 9.5
Sales net exposure | 37.8
Cost translation exposure | (22.4)
Cost transaction exposure | 3.8
Cost net exposure | (18.6)
JPY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 13.4
Sales net exposure | 13.4
Cost translation exposure | (5.2)
Cost net exposure | (5.2)
CAD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 4.5
Sales net exposure | 4.5
Cost transaction exposure | 0.3
Cost net exposure | 0.3
CNY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.1
Sales net exposure | 7.1
Cost translation exposure | (6.5)
Cost transaction exposure | 1.4
Cost net exposure | (5.1)
TWD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 5.5
Sales net exposure | 5.5
Cost translation exposure | (2.4)
Cost net exposure | (2.4)
INR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.4
Sales transaction exposure | (0.4)
Sales net exposure | 7.0
Cost translation exposure | (4.4)
Cost transaction exposure | 0.2
Cost net exposure | (4.2)
GBP [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.6
Sales transaction exposure | (0.9)
Sales net exposure | 6.7
Cost translation exposure | (6.2)
Cost transaction exposure | (0.2)
Cost net exposure | (6.4)
AUD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 7.6
Sales transaction exposure | (0.6)
Sales net exposure | 7.0
Cost translation exposure | (5.0)
Cost transaction exposure | 0.4
Cost net exposure | kr (4.6)

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

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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

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_JPY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CAD
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_TWD
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_GBP
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: |