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Interest-Bearing Liabilities - Reconciliation of Liabilities Arising from Financing Activities (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Detailed Information About Borrowings [Line Items]      
Opening balance kr 46,873    
Cash flows      
Proceeds from issuance borrowings 3,615 kr 19,728 kr 10,755
Repayment of borrowings (15,917) (7,884) (16,029)
Other financing activities 162 1,124 352
Lease payments (2,492) (2,857) (2,593)
Non-cash changes      
Closing balance 38,041 46,873  
Liabilities Arising From Financing Activities [Member]      
Disclosure Of Detailed Information About Borrowings [Line Items]      
Opening balance 54,328 42,234  
Cash flows      
Proceeds from issuance borrowings 3,615 19,728  
Repayment of borrowings (15,917) (7,884)  
Other financing activities 152 1,101  
Lease payments (2,492) (2,857)  
Non-cash changes      
Effect of foreign exchange movement 2,705 930  
Revaluation due to changes in credit risk 567 667  
Other changes in fair value 343 1,131  
New and extended lease contracts 2,536 1,547  
Balances regarding acquired business 0 2  
Other non-cash movements (301) (411)  
Closing balance kr 45,536 kr 54,328 kr 42,234