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Share Based Compensation - Additional Information (Detail)
kr / shares in Units, kr in Millions, $ in Millions
 12 Months Ended
Jan. 01, 2019
Employee
Dec. 31, 2023
SEK (kr)
Employee
Participants
Country
kr / shares
shares
Dec. 31, 2022
USD ($)
Employee
Country
Participants
Dec. 31, 2022
SEK (kr)
Employee
Country
Participants
Dec. 31, 2021
Employee
Dec. 31, 2020
Employee
Dec. 31, 2019
Employee
kr / shares
shares
Dec. 31, 2016
kr / shares
shares
Disclosure of Information About Board Management and Employees [line items]                
Percentage of high award level             22.50%  
share price at vesting | kr / shares   kr 60.31            
Payout amount at vesting | kr   kr 604.4            
Strike price | kr / shares             kr 87.97  
Reporting year [member]                
Disclosure of Information About Board Management and Employees [line items]                
Compensation expense charged | kr   1,371.0   kr 450.0        
Provisions for cash settled plans | kr   1,584.0   985.0        
Social Charges included in the provision for cash-settled plans | kr   kr 153.0   kr (120.0)        
No compensation expenses recognized during the period             four-year period  
Purchased call options [member]                
Disclosure of Information About Board Management and Employees [line items]                
Purchase of options shares | shares             128,452 1,000,000
Purchase of options shares | shares               2,000,000
Purchase price | kr / shares             kr 15.57 kr 0.49
No compensation expenses recognized during the period               seven-year period
Option extended exercise period   1 year            
Option exercise period   1 year            
Key contributor retention plan [member]                
Disclosure of Information About Board Management and Employees [line items]                
Compensation expense charged | kr   kr 1,250.0            
Executive performance plan [member]                
Disclosure of Information About Board Management and Employees [line items]                
Compensation expense charged | kr   kr 39.0            
Executive Performance Plan 2020 (EPP 2020) [member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of senior managers who selected for plan           155    
Executive Performance Plan 2020 (EPP 2020) [member] | All Countries Except USA [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of regular award level           15.00%    
Percentage of high award level           25.00%    
Executive Performance Plan 2021 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of senior managers who selected for plan         159      
Executive Performance Plan 2021 [Member] | All Countries Except USA [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of regular award level         15.00%      
Percentage of high award level         25.00%      
Ericsson Share Purchase Plan [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of countries launched the plan | Country   77 77 77        
Stock issued during period value shares issued | shares   50,000            
Cash payment percentage out of contribution amount   15.00%            
Number of eligible employees   77,700            
Executive Performance Plan 2019 (EPP 2019) [member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of senior managers who selected for plan             161  
Percentage of regular award level             15.00%  
Executive Performance Plan 2022 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of senior managers who selected for plan     165 165        
Senior Managers [member] | Executive performance plan [member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of awards   three-year            
Board of directors [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of performance share awards granted   0.00% 162.76% 162.76% 200.00% 200.00% 200.00%  
Percentage of vesting level of LTV program         100.00% 100.00% 126.35%  
Retention Of Key Employees [member] | Key Contributor Plan 2021 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of awards         There are three award levels at 10%, 25% and 30% of the participants’ annual gross salary.      
Employee retention period         3 years      
Number of employees who selected for plan         7,246      
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of awards             There are three award levels at 10%, 25% and 30% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans) and was officially closed in 2022.  
Employee retention period             3 years  
Number of employees who selected for plan 6,941              
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2023 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of award to be paid   25.00%            
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2024 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of award to be paid   25.00%            
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2025 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of award to be paid   50.00%            
Retention Of Key Employees [member] | Key Contributor Plan 2020 (KC Plan 2020) [member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of awards           There are three award levels at 10%, 25% and 30% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans).    
Employee retention period           3 years    
Number of employees who selected for plan           7,007    
Retention Of Key Employees [member] | Key Contributor Plan 2023 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of awards   There are at multiple levels between 10%-50% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans).            
Employee retention period   3 years            
Number of employees who selected for plan   10,154            
Retention Of Key Employees [member] | Key Contributor Plan 2022 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Number of awards     There are at multiple levels between 10%-40% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans). There are at multiple levels between 10%-40% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans).        
Employee retention period     3 years 3 years        
Number of employees who selected for plan     7,704 7,704        
Vonage [Member] | Key Contributor Plan 2023 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Employee retention period   2 years            
Number of employees who selected for plan | Participants   87            
Description of award vesting condition   vesting is 50%/50% on each annual anniversary            
Performance share awards [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of performance share awards granted   19372.00%            
Performance share awards [member] | The President and CEO [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage value of awards on annual base salary   190.00% 190.00% 190.00% 190.00%      
Performance share awards [member] | Other participants [member] | Bottom of range [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage value of awards on annual base salary   30.00% 30.00% 30.00% 30.00%      
Performance share awards [member] | Other participants [member] | Top of range [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage value of awards on annual base salary   70.00% 70.00% 70.00% 70.00%      
Absolute TSR [member] | Board of directors [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of vesting level of LTV program         16.17% 6.65% 9.00%  
The President and CEO and The ET [member]                
Disclosure of Information About Board Management and Employees [line items]                
Compensation expense charged | kr   kr 82.0            
Long-term variable compensation program [member]                
Disclosure of Information About Board Management and Employees [line items]                
Vesting period   three years            
Long-term variable compensation program [member] | Performance share awards [member]                
Disclosure of Information About Board Management and Employees [line items]                
Vesting period   3 years            
Vesting description   Awards under LTV (Performance Share Awards) are granted to the participants, provided that certain performance conditions are met, to receive a number of shares, free of charge, following expiration of a three-year vesting period (vesting period).            
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Employee retention period     2 years 2 years        
Value of award to be paid | $     $ 4.8          
Number of participants with cash-settled retention plan | Participants     95 95        
Cash Settled Plans [Member] | 2023 [member] | Key Contributor Plan 2022 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of award to be paid     50.00% 50.00%        
Cash Settled Plans [Member] | 2024 [member] | Key Contributor Plan 2022 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of award to be paid     50.00% 50.00%        
Rest of the Countries [Member] | Executive Performance Plan 2022 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of regular award level     15.00% 15.00%        
Percentage of high award level     25.00% 25.00%        
CA [Member] | Executive Performance Plan 2022 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of high award level     45.00% 45.00%        
US [member] | Executive Performance Plan 2020 (EPP 2020) [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of regular award level           25.00%    
Percentage of high award level           35.00%    
US [member] | Executive Performance Plan 2021 [Member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of regular award level         25.00%      
Percentage of high award level         35.00%      
US [member] | Executive Performance Plan 2022 [member]                
Disclosure of Information About Board Management and Employees [line items]                
Percentage of regular award level     35.00% 35.00%