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Operating segments - Financial information of geographical area (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial information of geographical area [Line Items]      
Operating income ₩ 7,023,357 ₩ 6,458,670 ₩ 6,100,850
Non-current assets 10,657,964 10,605,421  
Domestic      
Financial information of geographical area [Line Items]      
Operating income 5,642,133 5,180,020 5,088,487
Non-current assets 9,797,256 10,185,952  
Overseas      
Financial information of geographical area [Line Items]      
Operating income 1,381,224 1,278,650 ₩ 1,012,363
Non-current assets ₩ 860,708 ₩ 419,469