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Taxes - Additional Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Income tax kr (2,785) kr (5,497) kr (6,270)
Effective tax rate (11.90%) 22.30% 21.40%
Expected applicable tax rate 20.60%    
Actuarial gains and losses related to pensions kr (251) kr (2,093)  
Cash flow hedges (380) (671)  
Revaluation of borrowings 137 (212)  
Deferred tax assets 22,375 19,394  
Tax loss carry-forwards 27,666 23,438  
Unrecognized tax loss carry forwards 8,918 8,490  
Unrecognized tax loss carry forwards, tax value 1,819 1,777  
Income tax related to non-controlling interests 0 (4)  
Unrecognized deferred tax credits tax value 1,148 1,296  
Recognized deferred tax credits tax value 5,453 2,081  
Non-tax deductible goodwill impairment test 31,900    
DeferredTax 1,406 1,617  
Other comprehensive income (loss) totals (494) (2,980)  
Current tax  (4,289) (7,353) kr (6,110)
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 (631) (2,099)  
Current tax  137 (881)  
Loss Carry Forwards [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Deferred tax assets kr 6,158 kr 5,190  
Sweden [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Expected applicable tax rate 20.60% 20.60% 20.60%
Impaired withholding tax assets   kr 411 kr 969
Sweden [member] | Loss Carry Forwards [member]      
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items]      
Deferred tax assets kr 4,172 kr 3,508