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Taxes - Tax Effects of Temporary Differences and Tax Loss Carry-forwards (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets kr 24,412 kr 22,375  
Deferred tax liabilities 1,295 3,880  
Net balance 23,117 18,495 kr 14,610
Intangible assets and property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,447 1,195  
Deferred tax liabilities 3,457 7,193  
RoU lease assets and similar assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 0    
Deferred tax liabilities 1,199 1,272  
Current assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,340 3,413  
Deferred tax liabilities 1,323 1,313  
Post employment benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,778 5,297  
Deferred tax liabilities 229 477  
Provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,788 3,980  
Deferred tax liabilities 0    
Lease liabilities and similar liabilities [membe]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,307 1,337  
Deferred tax liabilities 0    
Deferred tax credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,027 5,453  
Deferred tax liabilities 0    
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,394 2,095  
Deferred tax liabilities 359 178  
Loss Carry Forwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,603 6,158  
Deferred tax liabilities 0    
Deferred tax assets/ liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 29,684 28,928  
Deferred tax liabilities 6,567 10,433  
Net balance 23,117 18,495  
Netting of tax assets/ liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Netting of deferred tax assets (5,272) (6,553)  
Netting of deferred tax liabilities kr (5,272) kr (6,553)