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Intangible Assets - Additional Information (Detail)
kr in Millions
 12 Months Ended
Dec. 31, 2024
SEK (kr)
Dec. 31, 2023
SEK (kr)
Dec. 31, 2022
SEK (kr)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 56,077 kr 52,944  
Impairment charges of goodwill (1,260) (31,897) kr 0
Intangible assets other than goodwill kr 7,954 22,667  
Discount rate used in current measurement of fair value less costs of disposal 113.00%    
Percentage of decrease in long term Ebit 1.00%    
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 3,900,000,000    
By The End Of Two Thousand And Twenty Nine [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated number of devices to be manufactured 6,700,000,000    
Forecast [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Percentage of decrease in long term Ebit 1.00%    
iconectiv [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 1,200 1,100  
Vonage Holdings Corp [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Impairment charges of goodwill (900) (31,900) (15,300)
Recoverable amount cash generating unit kr 17,000 kr 29,500  
Percentage of goodwill and other intangible assets 50.00%    
Research And Development Expenses [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Write down of capitalized development expenses kr (400)    
Impairment charges of goodwill (1,200)    
Selling And Administrative Expenses [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Impairment charges of goodwill (12,600)    
Other Operating Expenses [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Impairment charges of goodwill kr (900)    
2025-2029 and 2029 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Percentage of estimated increase in mobile video traffic 19.00%    
Percentage of estimated increase in mobile data traffic 80.00%    
Percentage fixed wireless access of estimated increase in mobile data traffic 35.00%    
Percentage fixed wireless access of estimated increase in mobile traffic 27.00%    
Subscription by 2029 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Number of connected devices are forecasted 50,000,000,000 30,000,000,000  
Mobile Subscriptions [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated number of global mobile subscriptions 8,700,000,000    
Mobile Subscriptions [member] | Subscription by 2029 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated number of global mobile subscriptions 9,400,000,000    
Smart phone [member] | Subscription by 2029 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated number of global mobile subscriptions 8,100,000,000    
5G subscriptions [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated number of global mobile subscriptions 2,300,000,000    
5G subscriptions [member] | Subscription by 2029 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated number of global mobile subscriptions 5,600,000,000    
Enterprise Private Network and Wireless WAN [Member] | 2022-2028 [member] | CAGR [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Compound Annual Growth Rate 20.00%    
Enterprise Private Network and Wireless WAN [Member] | 2022-2028 [member] | CPaaS [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Compound Annual Growth Rate 10.00%    
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 8,000 kr 22,700  
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 7 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 3 years    
Networks [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 29,600 kr 27,800  
Write down of capitalized development expenses kr (40)    
Nominal annual growth rate 2.00% 2.00%  
Internet of things [member] | Subscription by 2029 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Number of connected devices are forecasted 39,000,000,000    
Cash Generating Unit [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill   kr 300  
Impairment charges of goodwill kr (14,700)    
Cash Generating Unit [Member] | 2022-2028 [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Nominal annual growth rate 15.00% 15.00%  
Enterprise Wireless Solutions [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 9,900 kr 9,000  
Write down of capitalized development expenses kr (200)    
Nominal annual growth rate 3.50% 3.50%  
Vonage [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 11,600 kr 11,100  
Head room of CGU 1,600    
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 3,400 16,100  
Cloud Software and Services [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 3,700 kr 3,500  
Nominal annual growth rate 1.50% 1.50%  
Enterprise [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill kr 22,700 kr 21,600  
Write down of capitalized development expenses     kr (61)