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Equity - Capital adjustments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Capital adjustments [Abstract]      
Beginning balance ₩ (807,114) ₩ (658,664)  
Acquisition of treasury stock (1,250,001) (700,000) ₩ (485,947)
Disposal and retirement of treasury stocks 900,000 450,297  
Repayments of hybrid bonds (1,322) 102,143  
Other transactions with owners (21,643) (890)  
Ending balance ₩ (1,180,080) ₩ (807,114) ₩ (658,664)