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Intangible assets - Intangible assets, net (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about intangible assets [abstract]      
Goodwill ₩ 4,656,673 ₩ 4,665,417  
Software 251,178 235,229  
Development cost 543,993 677,572  
Others 441,314 541,915  
Intangible assets, net ₩ 5,893,158 ₩ 6,120,133 ₩ 6,217,946