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Share Based Compensation - Additional Information (Detail)
kr / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2024
SEK (kr)
shares
Employee
Country
kr / shares
Dec. 31, 2023
SEK (kr)
Participants
Employee
Country
Dec. 31, 2022
USD ($)
Employee
Participants
Dec. 31, 2021
Employee
Dec. 31, 2016
kr / shares
shares
Disclosure of Information About Board Management and Employees [line items]          
Total compensation expense kr 4,257,000,000        
share price at vesting | kr / shares kr 55.63        
Payout amount at vesting kr 632,200,000        
Exercise price, share options granted | kr / shares kr 68.62        
Reporting year [member]          
Disclosure of Information About Board Management and Employees [line items]          
Total compensation expense kr 2,073,000,000 kr 1,371,000,000      
Provisions for cash settled plans 2,992,000,000 1,584,000,000      
Social Charges included in the provision for cash-settled plans kr 272,000,000 153,000,000      
No compensation expenses recognized during the period six-year        
Purchased call options [member]          
Disclosure of Information About Board Management and Employees [line items]          
Purchase of options shares | shares         1,000,000
Net proceeds from share options | kr / shares kr 2.44        
Number of share options exercised in share-based payment arrangement | shares 2,000,000        
Purchase of options shares | shares         2,000,000
Purchase price of share options | kr / shares         kr 0.49
No compensation expenses recognized during the period         seven-year period
Option extended exercise period 1 year        
Option exercise period 1 year        
Purchased call options [member] | Jan Carlson [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Purchase of options shares | shares 132,538        
Purchase price of share options | kr / shares kr 15.09        
Key contributor retention plan [member]          
Disclosure of Information About Board Management and Employees [line items]          
Compensation expense of cash settlement kr 1,953,000,000 1,250,000,000      
Executive performance plan [member]          
Disclosure of Information About Board Management and Employees [line items]          
Compensation expense of cash settlement kr 27,000,000 kr 39,000,000      
Executive Performance Plan 2021 [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Number of senior managers who selected for plan | Employee       159  
Ericsson Share Purchase Plan [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Number of countries launched the plan | Country 69 69      
Cash payment percentage out of contribution amount 15.00%        
Number of eligible employees | Employee 76,000        
Maximum value of yearly purchase of Ericsson B-shares kr 55,000        
Key Contributor Plan 2023 [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Vesting period   2 years      
Number of employees who selected for plan | Participants   87      
Executive Performance Plan 2022 [member]          
Disclosure of Information About Board Management and Employees [line items]          
Number of senior managers who selected for plan | Employee     165    
Senior Managers [member] | Executive performance plan [member]          
Disclosure of Information About Board Management and Employees [line items]          
Vesting period 3 years        
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.  
Vesting period       3 years  
Number of employees who selected for plan | Employee       7,246  
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 2024 [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Number of awards there are multiple levels between 10%–50% of the participants’ annual gross salary (deviation exists in legal entities Vonage). 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).        
Vesting period 3 years        
Number of employees who selected for plan | Employee 9,538        
Retention Of Key Employees [member] | Key Contributor Plan 2023 [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Vesting description   vesting is 50%/50% on each annual anniversary.      
Number of awards   There are 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).      
Vesting period   3 years      
Number of employees who selected for plan | Employee   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).    
Vesting period     3 years    
Number of employees who selected for plan | Employee     7,704    
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%  
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 10.00% 10.00% 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 100.00% 70.00% 70.00% 70.00%  
The President and CEO and The ET [member]          
Disclosure of Information About Board Management and Employees [line items]          
Compensation expense charged kr 93,000,000 kr 82,000,000      
The President and CEO and The ET [member] | Performance share awards [member]          
Disclosure of Information About Board Management and Employees [line items]          
Percentage value of awards on annual base salary 150.00%        
Long-term variable compensation program [member]          
Disclosure of Information About Board Management and Employees [line items]          
Vesting period 3 years        
Long-term variable compensation program [member] | Performance share awards [member]          
Disclosure of Information About Board Management and Employees [line items]          
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).        
Vesting period 3 years        
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member]          
Disclosure of Information About Board Management and Employees [line items]          
Vesting period     2 years    
Value of award to be paid | $     $ 4.8    
Number of participants with cash-settled retention plan | Participants     95    
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member] | 2023 [member]          
Disclosure of Information About Board Management and Employees [line items]          
Percentage of award to be paid     50.00%    
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member] | 2024 [member]          
Disclosure of Information About Board Management and Employees [line items]          
Percentage of award to be paid     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%    
Percentage of high award level     25.00%    
All Countries Except USA [member] | Executive Performance Plan 2021 [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%  
US [member] | Key Contributor Plan 2021 [Member]          
Disclosure of Information About Board Management and Employees [line items]          
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%  
US [member] | Executive Performance Plan 2022 [member]          
Disclosure of Information About Board Management and Employees [line items]          
Percentage of regular award level     35.00%    
CA [Member] | Executive Performance Plan 2022 [member]          
Disclosure of Information About Board Management and Employees [line items]          
Percentage of high award level     45.00%