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Business Combinations - Additional Information (Detail) - SEK (kr)
kr in Millions
3 Months Ended 12 Months Ended
Apr. 03, 2023
Jul. 21, 2022
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Business Combinations [Line Items]            
Cash flow effect pursuant to business combinations       kr 1,309 kr 51,734  
Goodwill       31,897 0 kr 112
Deferred consideration payable       7    
Divestments [Member]            
Disclosure Of Business Combinations [Line Items]            
Cash flow effect pursuant to business combinations       (633) kr 20  
Vonage Holdings Corp [member]            
Disclosure Of Business Combinations [Line Items]            
Date of acquisition   Jul. 21, 2022        
Goodwill     kr 31,900 kr 31,900    
Ericom Software Limited [Member] | Cradlepoint [Member]            
Disclosure Of Business Combinations [Line Items]            
Date of acquisition Apr. 03, 2023          
Business acquisition, ownership percentage       100.00%    
Vonage [Member]            
Disclosure Of Business Combinations [Line Items]            
Date of acquisition       Jul. 01, 2022    
Cash and cash equivalents in subsidiary or businesses acquired or disposed       kr 737