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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, 2021 | Dec. 31, 2020
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Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 347,877 | ₩ 258,516
Less: non-current | (259,435) | (258,516)
Current | 88,442 |
Equity Instruments Listed [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 19,079 | 6,216
Equity Instruments Unlisted [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | 234,048 | 245,730
Debt securities [member] |  |
Financial assets at fair value through other comprehensive income [line items] |  |
Equity Instruments | ₩ 94,750 | ₩ 6,570

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