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Risk Management - Summary of Capital Risk Management (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Capital risk management [Abstract] |  |  |  |
Total borrowings and debt securities | ₩ 120,605,365 | ₩ 80,529,513 |  |
Cash and cash equivalents | 3,234,780 | 2,635,238 | ₩ 2,029,584 | ₩ 1,810,129
Net borrowings and debt securities | 117,370,585 | 77,894,275 |  |
Total equity | ₩ 42,000,256 | ₩ 65,326,706 | ₩ 70,668,059 | ₩ 68,889,649
Debt to equity ratio | 279.45% | 119.24% |  |

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