v3.25.4
Derivatives and hedge accounting - Maturity analysis (Details) - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
Interest rate-related contracts | Hedge of fixed rate assets    
Derivatives used as fair-value hedge    
Nominal amounts 224,378 256,544
Interest rate-related contracts | Hedge of fixed rate assets | Within 1 year    
Derivatives used as fair-value hedge    
Nominal amounts 58,290 70,503
Interest rate-related contracts | Hedge of fixed rate assets | Between 1 and 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 137,043 148,112
Interest rate-related contracts | Hedge of fixed rate assets | More than 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 29,045 37,929
Interest rate-related contracts | Hedge of fixed rate liabilities    
Derivatives used as fair-value hedge    
Nominal amounts 3,257 5,000
Interest rate-related contracts | Hedge of fixed rate liabilities | Within 1 year    
Derivatives used as fair-value hedge    
Nominal amounts   5,000
Interest rate-related contracts | Hedge of fixed rate liabilities | Between 1 and 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 1,240  
Interest rate-related contracts | Hedge of fixed rate liabilities | More than 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 2,017  
Interest rate-related contracts | Hedge of floating rate assets    
Derivatives used as fair-value hedge    
Nominal amounts   4,582
Interest rate-related contracts | Hedge of floating rate assets | Within 1 year    
Derivatives used as fair-value hedge    
Nominal amounts   1,155
Interest rate-related contracts | Hedge of floating rate assets | Between 1 and 5 years    
Derivatives used as fair-value hedge    
Nominal amounts   1,194
Interest rate-related contracts | Hedge of floating rate assets | More than 5 years    
Derivatives used as fair-value hedge    
Nominal amounts   2,233
Currency-related contracts | Hedge of fixed rate assets    
Derivatives used as fair-value hedge    
Nominal amounts 18,400 18,450
Currency-related contracts | Hedge of fixed rate assets | Within 1 year    
Derivatives used as fair-value hedge    
Nominal amounts 4,262 452
Currency-related contracts | Hedge of fixed rate assets | Between 1 and 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 13,730 11,936
Currency-related contracts | Hedge of fixed rate assets | More than 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 408 6,062
Currency-related contracts | Hedge of fixed rate liabilities    
Derivatives used as fair-value hedge    
Nominal amounts 13,767 16,811
Currency-related contracts | Hedge of fixed rate liabilities | Within 1 year    
Derivatives used as fair-value hedge    
Nominal amounts 1,948 8,199
Currency-related contracts | Hedge of fixed rate liabilities | Between 1 and 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 8,190 7,966
Currency-related contracts | Hedge of fixed rate liabilities | More than 5 years    
Derivatives used as fair-value hedge    
Nominal amounts 3,629 646