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Capital risk management (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Capital risk management [Abstract] |  |  |  |
Total borrowings and debt securities | ₩ 69,724,581 | ₩ 67,876,541 |  |
Cash and cash equivalents | 2,029,584 | 1,810,129 | ₩ 1,358,345 | ₩ 2,369,739
Net borrowings and debt securities | 67,694,997 | 66,066,412 |  |
Total shareholders' equity | ₩ 70,666,846 | ₩ 68,889,649 | ₩ 71,092,762 | ₩ 72,964,641
Debt to equity ratio | 95.79% | 95.90% |  |

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