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Provisions - Summary of provisions (Parenthetical) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [line items]      
Provisions ₩ 1,363,345 ₩ 1,308,896  
Maximum      
Disclosure of other provisions [line items]      
Provisions 305,237 317,857  
Provision for vulnerable group      
Disclosure of other provisions [line items]      
New provisions, other provisions   25,856  
Miscellaneous other provisions [member]      
Disclosure of other provisions [line items]      
Provisions 695,785 579,114 ₩ 819,616
New provisions, other provisions ₩ 8,643 ₩ 19,086