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Borrowings and Debt Securities : Long-term borrowings (Details)
₨ in Thousands, ¥ in Thousands, Rp in Thousands, JD in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2017
KRW (₩)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JOD (JD)
Dec. 31, 2017
IDR (Rp)
Dec. 31, 2017
PKR (₨)
Dec. 31, 2016
JPY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
JOD (JD)
Dec. 31, 2016
IDR (Rp)
Dec. 31, 2016
PKR (₨)
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 2,584,280 ₩ 2,110,727                    
Less : Discount on long-term borrowings (21,999) (26,838)                    
Less : Current portion of long-term borrowings (128,543) (310,977)                    
Add : Current portion of discount on long-term borrowings 886 979                    
Long-term borrowings ₩ 2,434,624 ₩ 1,773,891                    
Local long-term borrowings 1 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Others Others                    
Borrowings interest rate 0.50 0.50                    
Borrowings, maturity 2018~2044 2018~2044                    
Borrowings ₩ 4,909 ₩ 5,663                    
Local long-term borrowings 2 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 2.45~4.60 2.45~4.60                    
Borrowings, maturity 2023~2028 2023~2028                    
Borrowings ₩ 68,883 ₩ 61,835                    
Local long-term borrowings 3 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 1yr KoFC bond rate+0.31 1yr KoFC bond rate+0.31                    
Borrowings, maturity 2018 2018                    
Borrowings ₩ 25,000 ₩ 125,000                    
Local long-term borrowings 4 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Operating funds Operating funds                    
Borrowings interest rate 2.59~3.04 2.75                    
Borrowings, maturity 2018~2020 2018                    
Borrowings ₩ 47,000 ₩ 12,000                    
Local long-term borrowings 5 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank                      
Purpose of borrowings Operating funds                      
Borrowings interest rate 1yr KoFC bond rate+0.95                      
Borrowings, maturity 2020                      
Borrowings ₩ 14,000                      
Local long-term borrowings 6 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor KEB Hana Bank KEB Hana Bank                    
Purpose of borrowings Commercial Paper Commercial Paper                    
Borrowings interest rate 3M CD+0.24~0.32 3M CD+0.14                    
Borrowings, maturity 2021~2022 2017                    
Borrowings ₩ 400,000 ₩ 100,000                    
Local long-term borrowings 7 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor KEB Hana Bank KEB Hana Bank                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 4.60 4.60                    
Borrowings, maturity 2028 2028                    
Borrowings ₩ 15,038 ₩ 16,851                    
Local long-term borrowings 8 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor KEB Hana Bank KEB Hana Bank                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 3yr KTB rate-1.25 3yr KTB rate-1.25                    
Borrowings, maturity 2018~2028 2017~2028                    
Borrowings ₩ 8,947 ₩ 9,655                    
Local long-term borrowings 9 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor IBK IBK                    
Purpose of borrowings PF Refinancing PF Refinancing                    
Borrowings interest rate CD+1.25 CD+1.25                    
Borrowings, maturity 2030 2030                    
Borrowings ₩ 22,500 ₩ 22,500                    
Local long-term borrowings 10 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Export-Import Bank of Korea                    
Purpose of borrowings Project loans Project loans                    
Borrowings interest rate 1.5 1.5                    
Borrowings, maturity 2026 2026                    
Borrowings ₩ 25,042 ₩ 30,935                    
Local long-term borrowings 11 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea                      
Purpose of borrowings Operating funds                      
Borrowings interest rate 2.21                      
Borrowings, maturity 2020                      
Borrowings ₩ 35,000                      
Local long-term borrowings 12 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Korea Resources Corporation                    
Purpose of borrowings   Development of power resouces                    
Borrowings interest rate   3yr KTB rate -2.25                    
Borrowings, maturity   2022~2025                    
Borrowings   ₩ 14,039                    
Local long-term borrowings 13 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Korea Resources Corporation                    
Purpose of borrowings   Facility                    
Borrowings interest rate   3yr KTB rate -2.25                    
Borrowings, maturity   2017~2024                    
Borrowings   ₩ 3,842                    
Local long-term borrowings 14 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Korea Resources Corporation                    
Purpose of borrowings   Project loans                    
Borrowings interest rate   -                    
Borrowings, maturity   2022~2025                    
Borrowings   ₩ 3,733                    
Local long-term borrowings 15 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Korea Resources Corporation                    
Purpose of borrowings   Others                    
Borrowings interest rate   KTB rate -2.25                    
Borrowings, maturity   2024~2025                    
Borrowings   ₩ 12,131                    
Local long-term borrowings 16 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor [1] Korea Energy Agency                      
Purpose of borrowings [1] Development of power resouces                      
Borrowings interest rate [1] 3yr KTB rate-2.25                      
Borrowings, maturity [1] 2023~2025                      
Borrowings [1] ₩ 6,765                      
Local long-term borrowings 17 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor [1] Korea Energy Agency                      
Purpose of borrowings [1] Facility loan                      
Borrowings interest rate [1] 3yr KTB rate-2.25                      
Borrowings, maturity [1] 2018~2024                      
Borrowings [1] ₩ 3,121                      
Local long-term borrowings 18 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor [1] Korea Energy Agency                      
Purpose of borrowings [1] Project loans                      
Borrowings interest rate [1] -                      
Borrowings, maturity [1] 2022~2025                      
Borrowings [1] ₩ 3,733                      
Local long-term borrowings 19 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor [1] Korea Energy Agency                      
Purpose of borrowings [1] Others                      
Borrowings interest rate [1] KTB rate -2.25                      
Borrowings, maturity [1] 2024~2028                      
Borrowings [1] ₩ 18,455                      
Local long-term borrowings 20 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Collateral borrowing Collateral borrowing                    
Borrowings interest rate 2.32 2.22                    
Borrowings, maturity 2019 2017                    
Borrowings ₩ 30,000 ₩ 30,000                    
Local long-term borrowings 21 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Facility loan Facility loan                    
Borrowings interest rate CB rate+1.10 CB rate+1.10                    
Borrowings, maturity 2028 2028                    
Borrowings ₩ 22,557 ₩ 25,276                    
Local long-term borrowings 22 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Operating funds Operating funds                    
Borrowings interest rate 2.70 2.70~2.86                    
Borrowings, maturity 2018 2017~2018                    
Borrowings ₩ 15,000 ₩ 25,000                    
Local long-term borrowings 23 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Others Others                    
Borrowings interest rate 4.10 4.10                    
Borrowings, maturity 2035 2035                    
Borrowings ₩ 105,000 ₩ 55,000                    
Local long-term borrowings 24 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Others Others                    
Borrowings interest rate Standard overdraft rate +1.10 3yr KTB rate+1.10                    
Borrowings, maturity 2035 2035                    
Borrowings ₩ 105,000 ₩ 55,000                    
Local long-term borrowings 25 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank Kookmin Bank                    
Purpose of borrowings Facility loan Facility loan                    
Borrowings interest rate MOR+0.79 MOR+0.62~0.79                    
Borrowings, maturity 2023 2017~2023                    
Borrowings ₩ 35,000 ₩ 45,000                    
Local long-term borrowings 26 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank                      
Purpose of borrowings Facility loan                      
Borrowings interest rate 3.16                      
Borrowings, maturity 2020                      
Borrowings ₩ 10,000                      
Local long-term borrowings 27 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings Facility loan Facility loan                    
Borrowings interest rate 1.75~4.60 1.75~4.60                    
Borrowings, maturity 2026~2029 2026~2029                    
Borrowings ₩ 148,423 ₩ 146,472                    
Local long-term borrowings 28 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings Facility loan Facility loan                    
Borrowings interest rate CB rate+1.10~1.20 CB rate+1.10~1.20                    
Borrowings, maturity 2022~2028 2022~2028                    
Borrowings ₩ 46,278 ₩ 34,951                    
Local long-term borrowings 29 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings PF Refinancing PF Refinancing                    
Borrowings interest rate 4.1 4.1                    
Borrowings, maturity 2030 2030                    
Borrowings ₩ 62,500 ₩ 62,500                    
Local long-term borrowings 30 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings Others Others                    
Borrowings interest rate 4.50~8.00 8                    
Borrowings, maturity 2022~2039 2036                    
Borrowings ₩ 102,346 ₩ 102,347                    
Local long-term borrowings 31 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Other Creditors                    
Purpose of borrowings   Others                    
Borrowings interest rate   -                    
Borrowings, maturity   2028                    
Borrowings   ₩ 7,250                    
Local long-term borrowings 32 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings 1,380,497 1,006,980                    
Foreign long-term borrowings [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 1,203,783 ₩ 1,103,747                    
Foreign long-term borrowings 1 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Korea National Oil Corporation                    
Purpose of borrowings   Project loans                    
Borrowings interest rate   -                    
Borrowings, maturity   2021~2023                    
Borrowings   ₩ 10,567             $ 8,744      
Foreign long-term borrowings 2 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor [1] Korea Energy Agency                      
Purpose of borrowings [1] Project loans                      
Borrowings interest rate [1] -                      
Borrowings, maturity [1] 2021~2023                      
Borrowings ₩ 9,368 [1]     $ 8,744                
Foreign long-term borrowings 3 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others                      
Purpose of borrowings Direct loan and others                      
Borrowings interest rate 1M Libor+1.80~3.20                      
Borrowings, maturity 2036                      
Borrowings ₩ 69,548     64,913                
Foreign long-term borrowings 4 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Direct loan and others Direct loan and others                    
Borrowings interest rate 3M Libor+2.75~3.70 3M Libor+2.75~3.70                    
Borrowings, maturity 2027 2027                    
Borrowings ₩ 254,514 ₩ 305,332     JD 168,663         JD 178,892    
Foreign long-term borrowings 5 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Commercial loan and others Commercial loan and others                    
Borrowings interest rate 3M Libor+1.50~2.50 3M Libor+1.50~2.50                    
Borrowings, maturity 2030~2033 2030~2033                    
Borrowings ₩ 309,662 ₩ 362,379   289,026         299,859      
Foreign long-term borrowings 6 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings PF Loan PF Loan                    
Borrowings interest rate 6M Libor+1.70~2.50 6M Libor+2.50~2.70                    
Borrowings, maturity 2032 2032                    
Borrowings ₩ 132,054 ₩ 144,594   123,253         119,647      
Foreign long-term borrowings 7 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor SCNT and others SCNT and others                    
Purpose of borrowings Shareholder’s loan Shareholder’s loan                    
Borrowings interest rate 6.50~8.00 6.50~8.00                    
Borrowings, maturity 2023 2023                    
Borrowings ₩ 44,697 ₩ 49,086   41,718         40,618      
Foreign long-term borrowings 8 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor SCNT and others SCNT and others                    
Purpose of borrowings Shareholder’s loan Shareholder’s loan                    
Borrowings interest rate 8 8                    
Borrowings, maturity 2031 2031                    
Borrowings ₩ 7,750 ₩ 12,166     JD 5,136         JD 7,128    
Foreign long-term borrowings 9 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor PT PJB PT PJB                    
Purpose of borrowings Shareholder’s loan Shareholder’s loan                    
Borrowings interest rate 12.75 12.75                    
Borrowings, maturity 2019 2019                    
Borrowings ₩ 864 ₩ 1,500       Rp 10,932,568         Rp 16,705,505  
Foreign long-term borrowings 10 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Samsung Life Insurance and others Samsung Life Insurance and others                    
Purpose of borrowings Syndicated loan Syndicated loan                    
Borrowings interest rate 3.10 3.10                    
Borrowings, maturity 2032 2032                    
Borrowings ₩ 50,540 ₩ 18,227 ¥ 5,325,000         ¥ 1,758,000        
Foreign long-term borrowings 11 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Woori Bank and others Woori Bank and others                    
Purpose of borrowings Syndicated loan Syndicated loan                    
Borrowings interest rate JPY 6M Libor +2.00 JPY 6M Libor+2.10                    
Borrowings, maturity 2032 2032                    
Borrowings ₩ 32,602 ₩ 12,151 ¥ 3,435,000         ¥ 1,172,000        
Foreign long-term borrowings 12 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor SMBC and others SMBC and others                    
Purpose of borrowings Equity Bridge Loan Equity Bridge Loan                    
Borrowings interest rate 1M Libor+0.90 1M Libor+0.90                    
Borrowings, maturity 2019 2019                    
Borrowings ₩ 76,054 ₩ 45,897   70,986         37,978      
Foreign long-term borrowings 13 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor IFC and others IFC and others                    
Purpose of borrowings Others Others                    
Borrowings interest rate 6M Libor+5.00 6M Libor+5.00                    
Borrowings, maturity 2031 2031                    
Borrowings ₩ 161,195 ₩ 134,972         ₨ 16,652,350         ₨ 11,706,160
Foreign long-term borrowings 14 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Federal Financing Bank                      
Purpose of borrowings PF loan                      
Borrowings interest rate 2.39                      
Borrowings, maturity 2031                      
Borrowings ₩ 51,819     48,366                
Foreign long-term borrowings 15 [Member]                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings Others Others                    
Borrowings interest rate - -                    
Borrowings, maturity 2019 2019                    
Borrowings ₩ 3,116 ₩ 6,876   $ 2,907         $ 5,691      
[1] As of July 1, 2017, loan business for energy-related projects has been integrated into Korea Energy Agency in accordance with the Korean government’s restructuring of the public institutions.