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Income Taxes - Summary of Income Tax Expense (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Major components of tax expense (income) [abstract] |  |  |  |
Current income taxes | [1] | ₩ 665,415 | ₩ 598,276 | ₩ 802,997
Deferred income tax due to temporary differences |  | 54,613 | (332,431) | 3,631
Items recognized directly in equity |  | (107,893) | 55,109 | (17,261)
Income tax expense |  | ₩ 612,135 | ₩ 320,954 | ₩ 789,367
[1] | Refund (additional payment) of income taxes as a result of a final corporation tax return, tax audits and others credited (charged) directly to current income taxes.

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