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Intangible Assets - Additional Information (Detail) - SEK (kr)
kr in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 52,944 kr 84,570  
Impairment charges of goodwill   kr (31,897) 0 kr (112)
Number of connected devices are forecasted   26,000,000,000    
Percentage of decrease in long term Ebit   1.00%    
Intangible assets other than goodwill   kr 22,667 26,340  
By The End Of Two Thousand And Twenty Four [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of devices to be manufactured   3,500,000,000    
By The End Of Two Thousand And Twenty Eight [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of devices to be manufactured   5,500,000,000    
Forecast [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Percentage of decrease in long term Ebit   1.00%    
Vonage Holdings Corp [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Impairment charges of goodwill kr (31,900) kr (31,900)    
Recoverable amount cash generating unit   kr 29,500    
Percentage of goodwill and other intangible assets   50.00%    
Cradlepoint [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 9,000 9,000  
2024-2028 and 2028 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Percentage of estimated increase in mobile video traffic   25.00%    
Percentage of estimated increase in mobile data traffic   70.00%    
Percentage fixed wireless access of estimated increase in mobile data traffic   25.00%    
Percentage fixed wireless access of estimated increase in mobile traffic   30.00%    
Subscription by 2028 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Number of connected devices are forecasted   46,000,000,000    
Mobile Subscriptions [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of global mobile subscriptions   8,500,000,000    
Mobile Subscriptions [member] | Subscription by 2028 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of global mobile subscriptions   9,100,000,000    
Smart phone [member] | Subscription by 2028 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of global mobile subscriptions   8,200,000,000    
5G subscriptions [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of global mobile subscriptions   1,600,000,000    
5G subscriptions [member] | Subscription by 2028 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Estimated number of global mobile subscriptions   4,700,000,000    
Enterprise Private Network and Wireless WAN [Member] | 2022-2027 [member] | Forecast [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Compound Annual Growth Rate   24.00%    
Enterprise Private Network and Wireless WAN [Member] | 2023-2026 [member] | Forecast [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Compound Annual Growth Rate   24.00%    
Capitalised development expenditure [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Remaining amortisation period of intangible assets   3 years    
Customer Relationships IPR and other Intangible Assets [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Intangible assets other than goodwill   kr 22,700 26,300  
Customer Relationships IPR and other Intangible Assets [Member] | Top of range [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Remaining amortisation period of intangible assets   9 years    
Customer Relationships IPR and other Intangible Assets [Member] | Bottom of range [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Remaining amortisation period of intangible assets   6 years    
Networks [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 27,800 kr 28,500  
Nominal annual growth rate   2.00% 2.00%  
Internet of things [member] | Subscription by 2028 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Number of connected devices are forecasted   30,000,000,000    
Cash Generating Unit [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 300    
Goodwill   kr 300    
Cash Generating Unit [Member] | 2022-2027 [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Nominal annual growth rate   15.00% (20.00%)  
Vonage [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 11,100 kr 42,000  
Nominal annual growth rate   3.50% 3.50%  
Head room of CGU   kr 1,100    
Vonage [Member] | Customer Relationships IPR and other Intangible Assets [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Intangible assets other than goodwill   16,100 kr 18,800  
Cloud Software and Services [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 3,500 kr 3,600  
Write down of capitalized development expenses       137
Nominal annual growth rate   1.50% 2.00%  
Enterprise [Member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill   kr 21,600 kr 52,500  
Write down of capitalized development expenses     kr 61 kr 176