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Retained Earnings (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Retained Earnings Note Disclosure [Abstract] |  |  |  |
Legal reserves | [1] | ₩ 1,604,910 | ₩ 1,604,910 |
Voluntary reserves |  |  |  |
Reserve for investment on social overhead capital |  | 5,277,449 | 5,277,449 |
Reserve for research and human development | [2] | 330,000 | 330,000 |
Reserve for business expansion |  | 26,361,617 | 28,967,976 |
Reserve for equalizing dividends |  | 210,000 | 210,000 |
Voluntary reserves |  | 32,179,066 | 34,785,425 |
Retained earnings before appropriations |  | 17,349,625 | 12,811,798 |
Retained earnings |  | ₩ 51,133,601 | ₩ 49,202,133 | ₩ 51,519,119
[1] | The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO's common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in capital or offset against accumulated deficit by the resolution of the shareholders.
[2] | The reserve for research and human development is appropriated by KEPCO to use as qualified tax credits to reduce corporate tax liabilities. The reserve is available for cash dividends for a certain period as defined by the Restriction of Special Taxation Act of Korea.

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