v3.25.4
Impairments - Loss Allowance (Details) - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Loans and off balance      
Provision ratio (percent) 0.23% 0.15%  
Stage 1      
Loans and off balance      
Provision ratio (percent) 0.02% 0.02%  
Lifetime expected credit losses | Stage 2      
Loans and off balance      
Provision ratio (percent) 0.74% 0.18%  
Lifetime expected credit losses | Stage 3      
Loans and off balance      
Provision ratio (percent) 6.03% 3.25%  
Gross carrying amount      
Loans and off balance      
Loans and off balance kr 355,038 kr 350,246 kr 346,506
of which guaranteed (percent) 68.30% 67.30%  
Gross carrying amount | Loans      
Loans and off balance      
Loans and off balance kr 263,517 kr 283,931  
Gross carrying amount | Loans in the form of interest-bearing securities      
Loans and off balance      
Loans and off balance 47,492 48,732  
Gross carrying amount | Loans to credit institutions      
Loans and off balance      
Loans and off balance 15,011 10,328  
Gross carrying amount | Loans to the public      
Loans and off balance      
Loans and off balance 201,014 224,871  
Gross carrying amount | Off-balance      
Loans and off balance      
Loans and off balance 91,520 66,315  
Gross carrying amount | Guarantees      
Loans and off balance      
Loans and off balance 9,896 9,428  
Gross carrying amount | Committed undisbursed loans      
Loans and off balance      
Loans and off balance 81,624 56,887  
Gross carrying amount | Stage 1      
Loans and off balance      
Loans and off balance kr 298,275 kr 289,986 278,263
of which guaranteed (percent) 64.40% 61.90%  
Gross carrying amount | Stage 1 | Loans      
Loans and off balance      
Loans and off balance kr 222,137 kr 245,998  
Gross carrying amount | Stage 1 | Loans in the form of interest-bearing securities      
Loans and off balance      
Loans and off balance 46,131 48,665  
Gross carrying amount | Stage 1 | Loans to credit institutions      
Loans and off balance      
Loans and off balance 15,011 10,328  
Gross carrying amount | Stage 1 | Loans to the public      
Loans and off balance      
Loans and off balance 160,994 187,005  
Gross carrying amount | Stage 1 | Off-balance      
Loans and off balance      
Loans and off balance 76,138 43,988  
Gross carrying amount | Stage 1 | Guarantees      
Loans and off balance      
Loans and off balance 9,729 7,533  
Gross carrying amount | Stage 1 | Committed undisbursed loans      
Loans and off balance      
Loans and off balance 66,409 36,455  
Gross carrying amount | Lifetime expected credit losses | Stage 2      
Loans and off balance      
Loans and off balance kr 50,803 kr 48,382 54,290
of which guaranteed (percent) 91.80% 94.20%  
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans      
Loans and off balance      
Loans and off balance kr 35,421 kr 30,678  
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans in the form of interest-bearing securities      
Loans and off balance      
Loans and off balance 1,361 67  
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans to the public      
Loans and off balance      
Loans and off balance 34,060 30,611  
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Off-balance      
Loans and off balance      
Loans and off balance 15,382 17,704  
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Guarantees      
Loans and off balance      
Loans and off balance 168 1,895  
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Committed undisbursed loans      
Loans and off balance      
Loans and off balance 15,214 15,809  
Gross carrying amount | Lifetime expected credit losses | Stage 3      
Loans and off balance      
Loans and off balance kr 5,960 kr 11,878 13,953
of which guaranteed (percent) 80.70% 94.30%  
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans      
Loans and off balance      
Loans and off balance kr 5,960 kr 7,255  
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans to the public      
Loans and off balance      
Loans and off balance 5,960 7,255  
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Off-balance      
Loans and off balance      
Loans and off balance   4,623  
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Committed undisbursed loans      
Loans and off balance      
Loans and off balance   4,623  
Accumulated impairment      
Loans and off balance      
Loans and off balance (807) (526) (795)
Accumulated impairment | Loans      
Loans and off balance      
Loans and off balance (805) (523)  
Accumulated impairment | Loans in the form of interest-bearing securities      
Loans and off balance      
Loans and off balance (7) (6)  
Accumulated impairment | Loans to credit institutions      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Loans to the public      
Loans and off balance      
Loans and off balance (798) (517)  
Accumulated impairment | Off-balance      
Loans and off balance      
Loans and off balance (2) (3)  
Accumulated impairment | Guarantees      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Committed undisbursed loans      
Loans and off balance      
Loans and off balance (1) (3)  
Accumulated impairment | Stage 1      
Loans and off balance      
Loans and off balance (69) (54) (167)
Accumulated impairment | Stage 1 | Loans      
Loans and off balance      
Loans and off balance (68) (51)  
Accumulated impairment | Stage 1 | Loans in the form of interest-bearing securities      
Loans and off balance      
Loans and off balance (6) (6)  
Accumulated impairment | Stage 1 | Loans to credit institutions      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Stage 1 | Loans to the public      
Loans and off balance      
Loans and off balance (62) (45)  
Accumulated impairment | Stage 1 | Off-balance      
Loans and off balance      
Loans and off balance (2) (3)  
Accumulated impairment | Stage 1 | Guarantees      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Stage 1 | Committed undisbursed loans      
Loans and off balance      
Loans and off balance (1) (3)  
Accumulated impairment | Lifetime expected credit losses | Stage 2      
Loans and off balance      
Loans and off balance (378) (86) (61)
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans      
Loans and off balance      
Loans and off balance (378) (86)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans in the form of interest-bearing securities      
Loans and off balance      
Loans and off balance (1) 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans to credit institutions      
Loans and off balance      
Loans and off balance 0    
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans to the public      
Loans and off balance      
Loans and off balance (377) (86)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Off-balance      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Guarantees      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Committed undisbursed loans      
Loans and off balance      
Loans and off balance 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3      
Loans and off balance      
Loans and off balance (359) (386) kr (567)
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans      
Loans and off balance      
Loans and off balance (359) (386)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans to the public      
Loans and off balance      
Loans and off balance kr (359) (386)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Off-balance      
Loans and off balance      
Loans and off balance   0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Committed undisbursed loans      
Loans and off balance      
Loans and off balance   kr 0