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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, 2019 | Dec. 31, 2018
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Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 557,342 | ₩ 326,157
Less: non-current | (556,147) | (326,157)
Current | 1,195 |
Equity Instruments Listed [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 6,738 | 8,861
Equity Instruments Unlisted [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 543,518 | 310,387
Debt securities [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 7,086 | ₩ 6,909

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