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Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 1,680,168 | ₩ 1,508,192
Less: non-current | (1,680,168) | (1,508,192)
Current | 0 | 0
Equity Instruments Listed [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 1,231,188 | 1,006,476
Equity Instruments Unlisted [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 443,067 | 496,284
Debt securities [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 5,913 | ₩ 5,432

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