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Retained Earnings and Dividends Paid - Summary of Retained Earnings (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Retained earnings [abstract]    
Legal reserves [1] ₩ 1,604,910 ₩ 1,604,910
Voluntary reserves 27,782,969 33,282,817
Retained earnings (Undisposed deficit) before appropriations (7,956,579) 10,370,517
Retained earnings 21,431,300 45,258,244
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 21,965,520 27,465,368
Reserve for equalizing dividends ₩ 210,000 ₩ 210,000
[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.