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Subsequent Events - Additional Information (Detail) - Conversion Of Investments In Debt Instruments Into Equity Investments As A Result Of Restructuring Of Investee [Member] - Bidiai Co Limited [Member] - Korea SouthEast Power [Member] ₩ in Billions	Feb. 17, 2023 KRW (₩)
Disclosure of non-adjusting events after reporting period [line items]
Investment in equity shares as a result of conersion of debt into equity of the investee company	₩ 32
Proportion of ownership interest in associate	32.54%

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The amount of instruments held by the entity that provide evidence of a residual interest in the assets of another entity after deducting all of its liabilities.

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