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General and administrative expenses - Summary of general and administrative expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Employee benefits:      
Salaries ₩ 3,522,053 ₩ 3,316,503 ₩ 3,247,162
Defined contribution 40,817 37,745 35,679
Defined benefit 143,751 114,943 109,444
PostemploymentBenefitExpenseDefinedBenefitPlans 184,568 152,688 145,123
Termination benefits 279,693 235,330 197,184
Subtotal 3,986,314 3,704,521 3,589,469
Entertainment 48,345 46,903 46,050
Depreciation 541,607 535,571 514,100
Amortization 308,321 279,095 225,900
Taxes and utility bills 316,925 272,018 245,723
Advertising 319,845 315,281 285,495
Research 27,341 23,917 21,494
Others 853,802 938,934 967,106
General and administrative expenses ₩ 6,402,500 ₩ 6,116,240 ₩ 5,895,337