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Retained Earnings (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Retained Earnings Note Disclosure [Abstract]      
Legal reserves [1] ₩ 1,604,910 ₩ 1,604,910  
Voluntary reserves [Abstract]      
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 29,016,395 26,029,826  
Reserve for equalizing dividends 210,000 210,000  
Voluntary reserves 34,833,844 31,847,275  
Retained earnings before appropriations 16,931,804 19,721,686  
Retained earnings ₩ 53,370,558 ₩ 53,173,871 ₩ 48,187,241
[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.