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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, 2024 | Dec. 31, 2023
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Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 1,665,368 | ₩ 1,680,168
Less: non-current | (1,665,368) | (1,680,168)
Current | 0 | 0
Equity Instruments Listed [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 1,317,458 | 1,231,188
Equity Instruments Unlisted [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 341,753 | 443,067
Debt instruments [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 6,157 | ₩ 5,913

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