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Income tax expense - Summary of income tax expense calculated by multiplying net income before tax with the tax rate (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Profit before income taxes ₩ 6,929,009 ₩ 6,029,092 ₩ 5,964,960
Income taxes at statutory tax rates 1,818,897 1,581,318 1,564,388
Non-taxable income (20,796) (44,370) (10,350)
Non-deductible expense 23,909 19,755 16,514
Tax credit (1,318) (1,484) (1,185)
Others 23,798 (84,297) (82,407)
Income tax expenses ₩ 1,844,490 ₩ 1,470,922 ₩ 1,486,960
Effective tax rate 26.62% 24.40% 24.93%