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v3.26.1

Income Taxes - Reconciliation Of Calculated Income Tax Expense Based on the Statutory Rate to Actual Amount of Taxes Recorded (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |
Profit before income taxes | ₩ 1,139,158 | ₩ 1,326,230 | ₩ 2,635,426
Income tax expense computed at statutory rate | 348,803 | 303,124 | 685,381
Adjustments: |  |  |
Tax credits | (35,757) | (22,122) | (82,233)
Additional income tax expense for prior years | (41,631) | (77,482) | 152,656
Investment in subsidiaries, associates and joint ventures | (1,691) | 107,197 | 146,498
Tax effects due to permanent differences | 9,010 | (3,801) | (3,011)
Carryforward of unused tax losses | (3,418) | (19,545) | (126,110)
Effect of tax rate change | 253,132 | 7,368 | 4,998
Others | 83,687 | 26,215 | 11,188
Adjustments | 263,332 | 17,830 | 103,986
Income tax expense | ₩ 612,135 | ₩ 320,954 | ₩ 789,367
Effective tax rate | 53.74% | 24.20% | 29.95%

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