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Other Components Of Equity - Summary of Reserves (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Disclosure of reserves within equity [abstract]
Capital adjustment from investments in equity-accounted investees	₩ 126,043	₩ 76,870
Changes in fair value of equity investments at fair value through other comprehensive income	341,198	20,066
Foreign currency translation differences	1,016,290	983,071
Losses on valuation of derivatives	(917)	(925)
Others	78,896	76,347
Reserves	₩ 1,561,510	₩ 1,155,429

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A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

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A component of equity representing exchange differences on translation of financial statements recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income]

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A component of equity representing the reserve of gains and losses on financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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Cumulative unrecognised share of losses of associates and joint ventures.

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Gain (loss) on valuation of derivatives.

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Other miscellaneous reserves.

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