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Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Valuation gain | ₩ 45,757 | ₩ 154,674 | ₩ 203,961
Valuation loss | 162 | 21,213 | 7,206
Other comprehensive income | (30,218) | 85,201 | 191,570
Interest rate swap [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Valuation gain | 48 | 63 | 0
Valuation loss | 0 | 490 | 0
Other comprehensive income | (2,945) | 4,666 | 1
Currency swap [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Valuation gain | 45,709 | 154,611 | 203,961
Valuation loss | 162 | 20,723 | 7,206
Other comprehensive income | (27,273) | 79,781 | 191,569
Currency forwards [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Valuation gain | 0 | 0 | 0
Valuation loss | 0 | 0 | 0
Other comprehensive income | ₩ 0 | ₩ 754 | ₩ 0

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