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Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Increase (decrease) of income before income tax |  |  |
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items] |  |  |
10% Increase |  | ₩ (1,336,821) | ₩ (1,197,530)
10% Decrease |  | 1,336,821 | 1,197,530
Increase (decrease) of shareholder's equity |  |  |
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items] |  |  |
10% Increase | [1] | (1,336,821) | (1,197,530)
10% Decrease | [1] | ₩ 1,336,821 | ₩ 1,197,530
[1] | The effect on the shareholders' equity excluding the impact of income taxes.

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