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Interest-Bearing Liabilities - Additional Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Interest Bearing Liabilities [Line Items]    
Borrowings kr 38,041 kr 46,873
Commercial papers [member]    
Disclosure Of Interest Bearing Liabilities [Line Items]    
Borrowings kr 1,607 2,014
Weighted average yield percent 2.788%  
Subsidiaries [Member] | Short-term borrowings [member]    
Disclosure Of Interest Bearing Liabilities [Line Items]    
Borrowings kr 700 kr 2,200
Parent company funding [member]    
Disclosure Of Interest Bearing Liabilities [Line Items]    
Weighted average interest rate of long term debt 5.88% 5.15%