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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Detailed Information About Borrowings [Line Items]      
Opening balance kr 32,930    
Cash flows      
Proceeds from issuance of borrowings 19,728 kr 10,755 kr 7,882
Repayment of borrowings (7,884) (16,029) (5,791)
Other financing activities 1,124 352 (2,183)
Lease payments (2,857) (2,593) (2,368)
Non-cash changes      
Closing balance 46,873 32,930  
Liabilities Arising From Financing Activities [Member]      
Disclosure Of Detailed Information About Borrowings [Line Items]      
Opening balance 42,234 41,134  
Cash flows      
Proceeds from issuance of borrowings 19,728 10,755  
Repayment of borrowings (7,884) (16,029)  
Other financing activities 1,101 315  
Lease payments (2,857) (2,593)  
Non-cash changes      
Effect of foreign exchange movement (930) 4,762  
Revaluation due to changes in credit risk 667 (1,030)  
Other changes in fair value 1,131 (2,888)  
New lease contracts 1,547 1,986  
Balances regarding acquired business 2 6,876  
Other non-cash movements (411) (1,054)  
Closing balance kr 54,328 kr 42,234 kr 41,134