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Taxes - Additional Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Income tax kr (2,215) kr (2,785) kr (5,497)
Effective tax rate 85.60% (11.90%) 22.30%
Deferred tax assets kr 24,412 kr 22,375  
Tax loss carry-forwards 25,354 27,666  
Unrecognized tax loss carry forwards 11,025 8,918  
Unrecognized tax loss carry forwards, tax value 2,399 1,819  
Unrecognized deferred tax credits tax value 1,114 1,148  
Recognized deferred tax credits tax value 5,027 5,453  
Non-tax deductible goodwill impairment test 15,100 31,900  
DeferredTax 4,563 1,406  
Current tax  (6,461) (4,289) kr (7,353)
Department of justice [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Income tax     450
Other comprehensive income [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
DeferredTax 507 (631)  
Current tax  117 137  
Loss Carry Forwards [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Deferred tax assets kr 5,603 6,158  
Sweden [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Expected applicable tax rate 20.60%    
Impaired withholding tax assets     kr 411
Sweden [member] | Loss Carry Forwards [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Deferred tax assets kr 3,815 kr 4,172