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Commitments and contingencies - Summary of pending litigations (Details) (Parenthetical) - KRW (₩)
₩ in Millions
Feb. 12, 2026
Feb. 11, 2026
Feb. 05, 2026
Dec. 31, 2025
Feb. 14, 2025
Loss Claim One [Member]          
litigations [Line Items]          
Litigation Settlement Payment         ₩ 63,200
Loss Claim Two [Member]          
litigations [Line Items]          
Litigation Settlement Payment     ₩ 41,500    
Litigation Provision       ₩ 40,100  
Loss claim regarding responsibility [Member]          
litigations [Line Items]          
Claim Amount first instance       169,930  
Claim Amount second instance       91,700  
Other litigations [Member]          
litigations [Line Items]          
Claim Amount first instance   ₩ 7,005      
Claim Amount second instance ₩ 5,000        
Litigation Provision first instance       3,694  
Litigation Provision second instance       ₩ 7,379