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Financial risk management - Maturity analysis for derivatives (Details) - Derivatives - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives ₩ (2,356,046) ₩ (1,634,074)
Less than 1 month    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives 771,588 453,751
1~3 months    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives (810,792) (12,670)
3~6 months    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives (29,804) (68,634)
6 months ~ 1 year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives (93,500) 6,511
1~5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives (2,117,259) (1,847,862)
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivatives ₩ (76,279) ₩ (165,170)