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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, 2018
KRW (₩)
Dec. 31, 2017
KRW (₩)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
JOD (JD)
Dec. 31, 2018
IDR (Rp)
Dec. 31, 2018
PKR (₨)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JOD (JD)
Dec. 31, 2017
IDR (Rp)
Dec. 31, 2017
PKR (₨)
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 3,593,009 ₩ 2,584,280                    
Less : Discount on long-term borrowings (22,972) (21,999)                    
Less : Current portion of long-term borrowings (312,994) (128,543)                    
Add : Current portion of discount on long-term borrowings 972 886                    
Long-term borrowings 3,258,015 2,434,624                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 1,914,531 ₩ 1,380,497                    
Local long-term borrowings                        
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 2019~2044 2018~2044                    
Borrowings ₩ 4,154 ₩ 4,909                    
Local long-term borrowings                        
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 ₩ 66,793 ₩ 68,883                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Korea Development Bank                    
Purpose of borrowings   Facility                    
Borrowings interest rate   1yr KoFC bond rate+0.31                    
Borrowings, maturity   2018                    
Borrowings   ₩ 25,000                    
Local long-term borrowings                        
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 2.59~3.04                    
Borrowings, maturity 2020~2021 2018~2020                    
Borrowings ₩ 67,000 ₩ 47,000                    
Local long-term borrowings                        
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 1yr KoFC bond rate+0.95 1yr KoFC bond rate+0.95                    
Borrowings, maturity 2020 2020                    
Borrowings ₩ 14,000 ₩ 14,000                    
Local long-term borrowings                        
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+0.24~0.32                    
Borrowings, maturity 2021~2022 2021~2022                    
Borrowings ₩ 950,000 ₩ 400,000                    
Local long-term borrowings                        
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 ₩ 13,781 ₩ 15,038                    
Local long-term borrowings                        
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 2019~2028 2018~2028                    
Borrowings ₩ 8,072 ₩ 8,947                    
Local long-term borrowings                        
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                        
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 ₩ 22,096 ₩ 25,042                    
Local long-term borrowings                        
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 Operating funds Operating funds                    
Borrowings interest rate 2.21 2.21                    
Borrowings, maturity 2020 2020                    
Borrowings ₩ 35,000 ₩ 35,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Development of power resouces Development of power resouces                    
Borrowings interest rate 3yr KTB rate-2.25 3yr KTB rate-2.25                    
Borrowings, maturity 2023~2025 2023~2025                    
Borrowings ₩ 5,558 ₩ 6,765                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 3yr KTB rate-2.25 3yr KTB rate-2.25                    
Borrowings, maturity 2019~2024 2018~2024                    
Borrowings ₩ 2,589 ₩ 3,121                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Project loans Project loans                    
Borrowings interest rate - -                    
Borrowings, maturity 2023 2022~2025                    
Borrowings ₩ 1,197 ₩ 3,733                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Others Others                    
Borrowings interest rate KTB rate -2.25 KTB rate -2.25                    
Borrowings, maturity 2024~2028 2024~2028                    
Borrowings ₩ 17,347 ₩ 18,455                    
Local long-term borrowings                        
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 2.32                    
Borrowings, maturity 2019 2019                    
Borrowings ₩ 30,000 ₩ 30,000                    
Local long-term borrowings                        
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 ₩ 20,672 ₩ 22,557                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Shinhan Bank and others                    
Purpose of borrowings   Operating funds                    
Borrowings interest rate   2.70                    
Borrowings, maturity   2018                    
Borrowings   ₩ 15,000                    
Local long-term borrowings                        
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 3.95 4.10                    
Borrowings, maturity 2035 2035                    
Borrowings ₩ 103,851 ₩ 105,000                    
Local long-term borrowings                        
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 Standard overdraft rate +1.10                    
Borrowings, maturity 2035 2035                    
Borrowings ₩ 103,851 ₩ 105,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank Kookmin Bank                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate MOR+0.79 MOR+0.79                    
Borrowings, maturity 2023 2023                    
Borrowings ₩ 30,333 ₩ 35,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank Kookmin Bank                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 3.16 3.16                    
Borrowings, maturity 2020 2020                    
Borrowings ₩ 10,000 ₩ 10,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate 1.75~4.60 1.75~4.60                    
Borrowings, maturity 2026~2036 2026~2029                    
Borrowings ₩ 168,080 ₩ 148,423                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Other Creditors Other Creditors                    
Purpose of borrowings Facility Facility                    
Borrowings interest rate CB rate+1.10~1.20 CB rate+1.10~1.20                    
Borrowings, maturity 2023~2036 2022~2028                    
Borrowings ₩ 52,810 ₩ 46,278                    
Local long-term borrowings                        
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                        
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 4.50~7.90 4.50~8.00                    
Borrowings, maturity 2022~2039 2022~2039                    
Borrowings ₩ 102,347 ₩ 102,346                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 1,678,478 ₩ 1,203,783                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor SCNT and others                      
Purpose of borrowings Others                      
Borrowings interest rate 3.88                      
Borrowings, maturity 2021                      
Borrowings ₩ 310,427     $ 278,105                
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Project loans Project loans                    
Borrowings interest rate - -                    
Borrowings, maturity 2021~2023 2021~2023                    
Borrowings ₩ 9,776 ₩ 9,368   8,744         $ 8,744      
Foreign long-term borrowings                        
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 1M Libor+1.80~3.20 1M Libor+1.80~3.20                    
Borrowings, maturity 2036 2036                    
Borrowings ₩ 138,542 ₩ 69,548   123,909         64,913      
Foreign long-term borrowings                        
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 ₩ 249,783 ₩ 254,514     JD 158,524         JD 168,663    
Foreign long-term borrowings                        
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 ₩ 310,315 ₩ 309,662   277,538         289,026      
Foreign long-term borrowings                        
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+1.70~2.50                    
Borrowings, maturity 2032 2032                    
Borrowings ₩ 141,773 ₩ 132,054   126,798         123,253      
Foreign long-term borrowings                        
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 ₩ 49,956 ₩ 44,697   44,680         41,718      
Foreign long-term borrowings                        
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 ₩ 7,647 ₩ 7,750     JD 4,853         JD 5,136    
Foreign long-term borrowings                        
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 ₩ 428 ₩ 864       Rp 5,569,304         Rp 10,932,568  
Foreign long-term borrowings                        
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 ₩ 53,565 ₩ 50,540 ¥ 5,286,835         ¥ 5,325,000        
Foreign long-term borrowings                        
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 +2.00                    
Borrowings, maturity 2032 2032                    
Borrowings ₩ 34,553 ₩ 32,602 ¥ 3,410,381         ¥ 3,435,000        
Foreign long-term borrowings                        
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 ₩ 49,218 ₩ 76,054   44,019         70,986      
Foreign long-term borrowings                        
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 ₩ 206,944 ₩ 161,195         ₨ 25,900,420         ₨ 16,652,350
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Federal Financing Bank Federal Financing Bank                    
Purpose of borrowings PF loan PF loan                    
Borrowings interest rate 2.39~13 2.39                    
Borrowings, maturity 2031~2038 2031                    
Borrowings ₩ 114,406 ₩ 51,819   102,322         48,366      
Foreign long-term borrowings                        
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 ₩ 1,145 ₩ 3,116   $ 1,025         $ 2,907