v3.25.4
Capital adequacy - Minimum capital requirements exclusive of buffers (Details) - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of credit risk exposure [line items]    
Min. capital requirement kr 7,993 kr 8,437
Separate    
Disclosure of credit risk exposure [line items]    
EAD 421,207 399,492
Risk exposure amount 99,912 105,465
Min. capital requirement 7,994 8,437
Separate | Credit risk | Standardized approach    
Disclosure of credit risk exposure [line items]    
EAD 5,829 5,558
Risk exposure amount 5,770 5,564
Min. capital requirement 462 445
Separate | Credit risk | Standardized approach | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 5,829 5,532
Risk exposure amount 5,770 5,528
Min. capital requirement 462 442
Separate | Credit risk | Standardized approach | Equity exposures    
Disclosure of credit risk exposure [line items]    
EAD   20
Risk exposure amount   30
Min. capital requirement   2
Separate | Credit risk | Standardized approach | Default exposures    
Disclosure of credit risk exposure [line items]    
EAD 0 6
Risk exposure amount 0 6
Min. capital requirement 0 1
Separate | Credit risk | IRB approach    
Disclosure of credit risk exposure [line items]    
EAD 415,378 393,934
Risk exposure amount 85,310 91,066
Min. capital requirement 6,825 7,285
Separate | Credit risk | IRB approach | Central governments    
Disclosure of credit risk exposure [line items]    
EAD 233,305 211,834
Risk exposure amount 9,487 9,159
Min. capital requirement 759 733
Separate | Credit risk | IRB approach | Financial institutions    
Disclosure of credit risk exposure [line items]    
EAD 32,236 34,067
Risk exposure amount 6,493 6,153
Min. capital requirement 519 492
Separate | Credit risk | IRB approach | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 149,636 147,820
Risk exposure amount 69,128 75,541
Min. capital requirement 5,530 6,043
Separate | Credit risk | IRB approach | Non-credit-obligation assets    
Disclosure of credit risk exposure [line items]    
EAD 201 213
Risk exposure amount 201 213
Min. capital requirement 16 17
Separate | Credit valuation adjustment risk    
Disclosure of credit risk exposure [line items]    
Risk exposure amount 1,882 1,936
Min. capital requirement 151 154
Separate | Foreign exchange risk    
Disclosure of credit risk exposure [line items]    
Risk exposure amount 2,494 1,498
Min. capital requirement 200 120
Separate | Commodity risk    
Disclosure of credit risk exposure [line items]    
Risk exposure amount 4 7
Min. capital requirement 0 1
Separate | Operational risk    
Disclosure of credit risk exposure [line items]    
Risk exposure amount 4,452 5,395
Min. capital requirement 356 432
Separate | Counterparty risk in derivatives | IRB approach | Financial institutions    
Disclosure of credit risk exposure [line items]    
EAD 5,145 5,899
Risk exposure amount 1,059 1,513
Min. capital requirement 85 121
Separate | Specialized lending | IRB approach | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 8,258 7,322
Risk exposure amount 8,473 5,019
Min. capital requirement kr 678 kr 402