v3.25.4
Capital adequacy - Own funds (Details) - Separate - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of objectives, policies and processes for managing capital [line items]    
Common equity Tier 1 (CET1) capital before regulatory adjustments kr 23,617 kr 23,899
Total regulatory adjustments to Common Equity Tier 1 capital (493) (502)
Total Common Equity Tier 1 capital 23,124 23,397
Total own funds 23,124 23,397
Share capital    
Disclosure of objectives, policies and processes for managing capital [line items]    
Common equity Tier 1 (CET1) capital before regulatory adjustments 3,990 3,990
Retained earnings    
Disclosure of objectives, policies and processes for managing capital [line items]    
Common equity Tier 1 (CET1) capital before regulatory adjustments 18,468 18,413
Accumulated other comprehensive income and other reserves    
Disclosure of objectives, policies and processes for managing capital [line items]    
Common equity Tier 1 (CET1) capital before regulatory adjustments 456 241
Independently reviewed profit net of any foreseeable charge or dividend    
Disclosure of objectives, policies and processes for managing capital [line items]    
Common equity Tier 1 (CET1) capital before regulatory adjustments 703 1,255
Additional value adjustments due to prudent valuations    
Disclosure of objectives, policies and processes for managing capital [line items]    
Total regulatory adjustments to Common Equity Tier 1 capital (83) (84)
Intangible assets    
Disclosure of objectives, policies and processes for managing capital [line items]    
Total regulatory adjustments to Common Equity Tier 1 capital (22) (22)
Fair value reserves related to gains or losses on cash flow hedges    
Disclosure of objectives, policies and processes for managing capital [line items]    
Total regulatory adjustments to Common Equity Tier 1 capital 0 3
Gains or losses on liabilities valued at fair value resulting from changes in own credit standing    
Disclosure of objectives, policies and processes for managing capital [line items]    
Total regulatory adjustments to Common Equity Tier 1 capital (229) (217)
IRB shortfall of credit risk adjustments to expected losses    
Disclosure of objectives, policies and processes for managing capital [line items]    
Total regulatory adjustments to Common Equity Tier 1 capital (144) (180)
Insufficient coverage for non-performing exposures    
Disclosure of objectives, policies and processes for managing capital [line items]    
Total regulatory adjustments to Common Equity Tier 1 capital kr (15) kr (2)