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Segment Information - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2023
Segment
Customer
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Number of operating segments reported | Segment 3    
Description of factors used to identify entity's reportable segments When determining Ericsson’s operating segments, consideration has been given to the financial reporting reviewed by the Chief Operating Decision Maker (CODM). Markets and what type of customers the products and services aim to attract has been considered, as well as the distribution channels they are sold through. Commonality regarding technology, research and development has also been taken into account. To best reflect the business focus, three operating segments are presented:    
Number of largest customers 10    
Bottom of range [Member]      
Disclosure of operating segments [line items]      
Number of customer base 500    
10 largest customers [member]      
Disclosure of operating segments [line items]      
Percentage of contribution to net sales 43.00% 50.00% 49.00%
Largest customer [member]      
Disclosure of operating segments [line items]      
Percentage of contribution to net sales 8.00% 14.00% 13.00%
Second largest customers [member]      
Disclosure of operating segments [line items]      
Percentage of contribution to net sales 7.00% 10.00% 9.00%
Networks [member] | IPR licensing revenues [member]      
Disclosure of operating segments [line items]      
Percentage of revenue 82.00% 82.00% 82.00%
Cloud Software and Services [Member] | IPR licensing revenues [member]      
Disclosure of operating segments [line items]      
Percentage of revenue 18.00% 18.00% 18.00%