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Sensitivity analysis for Interest rates (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Increase (decrease) of income before income tax |  |  |
Disclosure of Sensitivity analysis for Interest rates [Line Items] |  |  |
1% Increase |  | ₩ (25,167) | ₩ (23,831)
1% Decrease |  | 25,167 | 23,831
Increase (decrease) of shareholder's equity |  |  |
Disclosure of Sensitivity analysis for Interest rates [Line Items] |  |  |
1% Increase | [1] | (25,167) | (23,831)
1% Decrease | [1] | ₩ 25,167 | ₩ 23,831
[1] | The effect on the shareholders' equity excluding the impact of income taxes.

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