v3.25.4
Financial assets and liabilities at fair value - Financial assets & liabilities reported at fair value in fair value hierarchy (Details) - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value kr 343,254 kr 360,634  
Financial liabilities at fair value 314,304 330,209  
Debt securities issued      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 300,906 316,375  
Debt securities issued | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 2,598 3,452 kr 8,271
Derivatives      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 8,988 5,227  
Financial liabilities at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 25,848 23,135  
Financial liabilities at fair value through profit or loss | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 22,186 18,193  
Financial liabilities at fair value through profit or loss | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 3,662 4,942  
Financial liabilities at fair value through profit or loss | Debt securities issued      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 16,860 17,908  
Financial liabilities at fair value through profit or loss | Debt securities issued | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 14,262 14,456  
Financial liabilities at fair value through profit or loss | Debt securities issued | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 2,598 3,452  
Financial liabilities at fair value through profit or loss | Derivatives      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 8,988 5,227  
Financial liabilities at fair value through profit or loss | Derivatives | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 7,924 3,737  
Financial liabilities at fair value through profit or loss | Derivatives | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at fair value 1,064 1,490  
Financial assets at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 63,377 67,656  
Financial assets at fair value through profit or loss | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 22,215 22,648  
Financial assets at fair value through profit or loss | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 41,161 44,969  
Financial assets at fair value through profit or loss | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 1 39  
Treasuries/government bonds      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 13,419 4,150  
Treasuries/government bonds | Financial assets at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 13,419 4,150  
Treasuries/government bonds | Financial assets at fair value through profit or loss | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 1,031    
Treasuries/government bonds | Financial assets at fair value through profit or loss | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 12,388 4,150  
Other interest-bearing securities except loans      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 43,237 52,843  
Other interest-bearing securities except loans | Financial assets at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 43,237 52,843  
Other interest-bearing securities except loans | Financial assets at fair value through profit or loss | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 21,184 22,628  
Other interest-bearing securities except loans | Financial assets at fair value through profit or loss | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 22,053 30,215  
Derivatives      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 6,721 10,643  
Derivatives | Financial assets at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 6,721 10,643  
Derivatives | Financial assets at fair value through profit or loss | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 6,720 10,604  
Derivatives | Financial assets at fair value through profit or loss | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 1 39  
Shares      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value   20  
Shares | Financial assets at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value 0 20  
Shares | Financial assets at fair value through profit or loss | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value kr 0 kr 20