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Liability under insurance contracts and reinsurance contracts - Summary of fair value amounts of basic items of insurance contracts (Parenthetical) (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Abstract]    
Fair value of financial asset liabilities insurance ₩ 6,338,236 ₩ 5,498,129