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Financial Assets, Non-current - Summary of Financial Assets, Non-current (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Opening balance kr 2,091  
Opening balance 9,931  
Translation differences (2) kr (124)
Closing balance 2,029 2,091
Closing balance 19,440 9,931
Other investment in shares and participations [member] | Financial assets, non-current [member]    
Disclosure of financial assets [line items]    
Opening balance 2,091 2,074
Additions 207 206
Disposals/repayments/deductions (64) (2)
Amortization 0 0
Change in value in funded pension plans 0 0
Revaluation (202) (185)
Reclassification 0 0
Translation differences (3) (2)
Closing balance 2,029 2,091
Interest bearing securities, non-current [member] | Financial assets, non-current [member]    
Disclosure of financial assets [line items]    
Opening balance 9,931 9,164
Additions 15,950 12,887
Disposals/repayments/deductions (224) (4,127)
Amortization 0 0
Change in value in funded pension plans 0 0
Revaluation 160 269
Reclassification (6,377) (8,262)
Translation differences 0 0
Closing balance 19,440 9,931
Other financial assets, non-current [member] | Financial assets, non-current [member]    
Disclosure of financial assets [line items]    
Opening balance 6,350 6,839
Additions 2,919 1,899
Disposals/repayments/deductions (2,585) (816)
Amortization (136) (457)
Change in value in funded pension plans (960) (1,033)
Revaluation 21 0
Reclassification (455) (65)
Translation differences 7 (17)
Closing balance kr 5,161 kr 6,350