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Share Based Compensation - Summary of Stock Purchase Plans (Detail) - Ericsson Share Purchase Plan [Member]
 12 Months Ended
Dec. 31, 2023
Employee
Country
Dec. 31, 2022
Country
Disclosure Of Detailed Information About Stock Purchase Plans [Line Items]    
Number of participants 14,030  
Take-up rate – percent of eligible employees 18.00%  
Number of eligible employees 77,748  
Number of countries launched the plan | Country 77 77