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Financial Risk Management - Summary of Debt-to-equity Ratios (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [abstract] |  |  |  |
Total liabilities | ₩ 24,035,197 | ₩ 24,249,073 |  |
Total equity | ₩ 17,967,561 | ₩ 18,542,575 | ₩ 18,412,696 | ₩ 16,567,161
Debt-to-equity ratio | 134.00% | 131.00% |  |

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