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Financial Risk Management - Additional Information (Detail) € in Millions, kr in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
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Nov. 30, 2023 SEK (kr) | Nov. 30, 2023 USD ($) | Nov. 30, 2023 EUR (€) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 SEK (kr) Arrangements | Dec. 31, 2023 USD ($) | Dec. 31, 2022 SEK (kr) Arrangements | Dec. 31, 2021 SEK (kr) | Dec. 31, 2023 USD ($) Arrangements | Dec. 31, 2022 USD ($) Arrangements
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Description of objectives, policies and processes for managing risk |  |  |  |  | In order to spread the FX execution risk over the year, 14% of each of the next six months forecasted sales and purchases in EAB are hedged monthly, whereby forecasted sales (excluding volume in the 7 to 18 month cash flow hedge program) are funded by internal loans and forecasted purchases funded by deposits with its parent company. Cash flow hedge accounting is not designated, therefore the FX impact on revaluation of the internal loan and deposit is recognized in net FX as incurred. | In order to spread the FX execution risk over the year, 14% of each of the next six months forecasted sales and purchases in EAB are hedged monthly, whereby forecasted sales (excluding volume in the 7 to 18 month cash flow hedge program) are funded by internal loans and forecasted purchases funded by deposits with its parent company. Cash flow hedge accounting is not designated, therefore the FX impact on revaluation of the internal loan and deposit is recognized in net FX as incurred. |  |  |  |
Outstanding net deposit | $ |  |  |  |  |  |  |  |  | $ 199 |
Loans received | $ |  |  |  |  |  |  |  |  | 149 |
Average net loan balance | $ |  |  |  |  |  |  |  |  | $ 52 | $ 529
Net foreign exchange gains/losses |  |  |  |  | kr (1,020.0) |  | kr (1,259.0) | kr (1,547.0) |  |
Percentage of probability level |  |  |  |  | 99.00% | 99.00% |  |  |  |
Description of Sensitivity analysis |  |  |  |  | The Company uses the Value at Risk (VaR) methodology to measure foreign exchange and interest rate risks managed by the treasury function. This statistical method expresses the maximum potential loss that can arise with a certain degree of probability during a certain period of time. For the VaR measurement, the Company has chosen a probability level of 99% and a one-day time horizon. | The Company uses the Value at Risk (VaR) methodology to measure foreign exchange and interest rate risks managed by the treasury function. This statistical method expresses the maximum potential loss that can arise with a certain degree of probability during a certain period of time. For the VaR measurement, the Company has chosen a probability level of 99% and a one-day time horizon. |  |  |  |
Percentage of risk at confidence level |  |  |  |  | 99.00% | 99.00% |  |  |  |
Maximum foreign exchange positions |  |  |  |  | kr 45.0 |  |  |  |  |
Average of value at risk calculated |  |  |  |  | 15.9 |  | 21.0 |  |  |
Sensitivity to interest rate increase of 1 basis point |  |  |  |  | 2.0 |  |  |  |  |
Trade receivables and contract assets |  |  |  |  | 50,214.0 |  | 58,256.0 |  |  |
Provisions for expected credit losses on trade receivables and contract assets |  |  |  |  | 2,585.0 |  | 2,492.0 |  |  |
Receivables write-offs |  |  |  |  | kr 35.0 |  | 70.0 |  |  |
Information about major customers |  |  |  |  | the five largest facilities, calculated based on gross exposure, represented 86% (74%) of the customer finance exposure. | the five largest facilities, calculated based on gross exposure, represented 86% (74%) of the customer finance exposure. |  |  |  |
Customer finance credits |  |  |  |  | kr 9,681.0 |  | 7,758.0 |  |  |
Carrying value of customer finance credits |  |  |  |  | kr 6,917.0 |  | kr 5,370.0 |  |  |
Total customer finance arrangements | Arrangements |  |  |  |  | 65 |  | 73 |  | 65 | 73
Unutilized customer finance commitments |  |  |  |  | kr 37,019.0 |  | kr 54,086.0 |  |  |
Fair value revaluations for customer finance |  |  |  |  | 209.0 |  | (15.0) |  |  |
Customer finance credit realized losses |  |  |  |  | 209.0 |  | (17.0) |  |  |
Credit exposure |  |  |  |  | 400.0 |  | 800.0 |  |  |
Proceeds from issuance of borrowings |  |  |  |  | 19,728.0 |  | kr 10,755.0 | kr 7,882.0 |  |
Gain (loss) arising from derecognition of financial assets measured at amortised cost |  |  |  |  | 2.0 |  |  |  |  |
Fair value of assets reclassified from amortized cost to FVTPL |  |  |  |  | kr 2,900.0 |  |  |  |  |
Free cash flow before merger and acquisition as percent of net sales |  |  |  |  | (0.40%) | (0.40%) | 8.20% |  |  |
Long term borrowings average maturity duration |  |  |  |  | 3 years 8 months 12 days | 3 years 8 months 12 days | 3 years 9 months 18 days |  |  |
Nordic Investment Bank [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings maturity | 7-year | 7-year | 7-year |  |  |  |  |  |  |
Proceeds from issuance of borrowings | $ |  | $ 107 |  |  |  |  |  |  |  |
European Investment Bank [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings maturity | 7-year | 7-year | 7-year |  |  |  |  |  |  |
Proceeds from issuance of borrowings | $ |  | $ 273 |  |  |  |  |  |  |  |
Commercial paper program [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of borrowings | kr 2,000.0 |  |  |  |  |  |  |  |  |
Liquidity revolving credit facility [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Utilized | $ |  | 400 |  |  |  |  |  |  |  |
Funding program amount | $ |  | $ 1,000 |  |  |  |  |  |  |  |
Committed credit facilities amount | $ |  |  |  |  |  | $ 1,000 |  |  |  |
Ericssons Sustainability KPIs Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities amount | $ |  |  |  | $ 2,000 |  |  |  |  |  |
Euro Medium Term Note Program [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings maturity |  |  |  |  | 4.5-year | 4.5-year |  |  |  |
Proceeds from issuance of borrowings | € |  |  | € 500 |  |  |  |  |  |  |
Utilized | $ |  |  |  |  |  | $ 2,842 |  |  |  |
Funding program amount | $ |  |  |  |  |  | $ 5,000 |  |  |  |
South East Asia, Oceania and India [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate percentage of customer finance exposure |  |  |  |  | 38.00% | 38.00% | 18.00% |  |  |
Middle East and Africa [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate percentage of customer finance exposure |  |  |  |  | 22.00% | 22.00% | 30.00% |  |  |
Europe And Latin America [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate percentage of customer finance exposure |  |  |  |  | 21.00% | 21.00% | 27.00% |  |  |
North America [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate percentage of customer finance exposure |  |  |  |  | 19.00% | 19.00% | 24.00% |  |  |
Interest bearing liabilities [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Sensitivity to interest rate increase of 1 basis point |  |  |  |  | kr 9.0 |  |  |  |  |
Trade receivables [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Concentrations of risk |  |  |  |  | 47.00% | 47.00% | 45.00% |  |  |
Exchange rate risk [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
SEK exchange rate |  |  |  |  | 14 | 14 |  |  |  |
Currency risk [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Net realized FX gain |  |  |  |  | kr 4.0 |  |  |  |  |
Unrealized loss |  |  |  |  | 211.0 |  |  |  |  |
Net foreign exchange gains/losses |  |  |  |  | kr 207.0 |  |  |  |  |
Bottom of range [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Free cash flow before merger and acquisition as percent of net sales |  |  |  |  | 9.00% | 9.00% |  |  |  |
Top of range [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Sensitivity to interest rate increase of 1 basis point |  |  |  |  | kr 10.0 |  |  |  |  |
Top of range [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Free cash flow before merger and acquisition as percent of net sales |  |  |  |  | 12.00% | 12.00% |  |  |  |
Top of range [Member] | Interest bearing liabilities [member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Risk Management [Line Items] |  |  |  |  |  |  |  |  |  |
Sensitivity to interest rate increase of 1 basis point |  |  |  |  | kr 1.5 |  | kr 1.5 |  |  |

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