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Investment properties - Summary of income and expenses on investment property (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Rental income from investment property, net of direct operating expense [abstract]      
Rental income ₩ 35,725 ₩ 28,708 ₩ 24,472
Direct operating expenses for investment properties that generated rental income ₩ 12,733 ₩ 11,385 ₩ 12,905