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Risk Management - Summary of Capital Risk Management (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of Capital risk management [Abstract] |  |  |  |
Total borrowings and debt securities | ₩ 132,533,400 | ₩ 133,631,830 | ₩ 120,605,365 |
Cash and cash equivalents | 2,382,979 | 4,342,887 | 3,234,780 | ₩ 2,635,238
Net borrowings and debt securities | 130,150,421 | 129,288,943 |  |
Total equity | ₩ 41,362,833 | ₩ 37,264,750 | ₩ 42,000,256 | ₩ 65,326,706
Debt to equity ratio | 314.66% | 346.95% |  |

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