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Taxes - Tax Effects of Temporary Differences and Tax Loss Carry-forwards (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets kr 22,375 kr 19,394  
Deferred tax liabilities 3,880 4,784  
Net balance 18,495 14,610 kr 22,225
Intangible assets and property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,195 1,098  
Deferred tax liabilities 7,193 8,136  
RoU lease assets and similar assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 1,272 1,311  
Current assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 3,413 3,605  
Deferred tax liabilities 1,313 1,055  
Post employment benefits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,297 5,558  
Deferred tax liabilities 477 571  
Provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 3,980 5,215  
RoU lease liabilities and similar liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,337 1,394  
Deferred tax credits [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,453 2,081  
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,095 1,837  
Deferred tax liabilities 178 295  
Loss Carry Forwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,158 5,190  
Deferred tax assets/ liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 28,928 25,978  
Deferred tax liabilities 10,433 11,368  
Net balance 18,495 14,610  
Netting of tax assets/ liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Netting of deferred tax assets (6,553) (6,584)  
Netting of deferred tax liabilities kr (6,553) kr (6,584)