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Investment properties - Summary of changes in investment properties (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Changes in investment property [abstract]      
Beginning balance ₩ 327,696 ₩ 257,806  
Acquisition 80,103 3,582  
Disposal (5,507) (1,854)  
Depreciation (16,922) (15,063) ₩ (15,058)
Impairment loss recognized (694) 0  
Amounts transferred from property and equipment 4,829 77,752  
Amounts transferred from(to) assets held for sale [1] (52,138) 5,551  
Effects of foreign currency adjustments 6,279 (78)  
Effects of business combinations 267,974 0  
Ending balance ₩ 611,620 ₩ 327,696 ₩ 257,806
[1] Comprise buildings and land, etc.