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Provisions - Summary of provisions (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Provisions [Line Items]      
Provisions ₩ 1,363,345 ₩ 1,308,896  
Asset retirement obligations      
Provisions [Line Items]      
Provisions 106,125 99,306 ₩ 99,927
Expected loss related to litigation      
Provisions [Line Items]      
Provisions 144,173 114,750 31,371
Unused credit commitments      
Provisions [Line Items]      
Provisions 305,955 411,275  
Guarantee contracts issued      
Provisions [Line Items]      
Provisions 111,307 104,451  
Financial guarantee contracts      
Provisions [Line Items]      
Provisions 93,693 87,088  
Non-financial guarantee contracts issued      
Provisions [Line Items]      
Provisions 17,614 17,363  
Other      
Provisions [Line Items]      
Provisions ₩ 695,785 ₩ 579,114 ₩ 819,616