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Leases - Summary of gross investment and present value of minimum lease payment of finance lease (Parenthetical) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of maturity analysis of finance lease payments receivable [abstract]    
Interest income on finance lease receivables ₩ 135,004 ₩ 119,049