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Financial Risk Management - Additional Information (Detail)
€ in Millions, kr in Millions, $ in Millions
 1 Months Ended 12 Months Ended
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