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Income Taxes - Summary of Income Tax Expense (Detail) - KRW (₩) ₩ in Millions		12 Months Ended
		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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- Definition

The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Classes of financial instruments [domain]]

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