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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, 2019
KRW (₩)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JOD (JD)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
PKR (₨)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
JOD (JD)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
IDR (Rp)
Dec. 31, 2018
PKR (₨)
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Borrowings ₩ 3,628,631 ₩ 3,593,009                  
Less : Discount on long-term borrowings (22,309) (22,972)                  
Less : Current portion of long-term borrowings (217,579) (312,994)                  
Add : Current portion of discount on long-term borrowings 1,000 972                  
Long-term borrowings 3,389,743 3,258,015                  
Local long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Borrowings ₩ 2,283,166 ₩ 1,914,531                  
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 2020~2044 2019~2044                  
Borrowings ₩ 3,500 ₩ 4,154                  
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 2.50~4.60 2.45~4.60                  
Borrowings, maturity 2023~2028 2023~2028                  
Borrowings ₩ 59,845 ₩ 66,793                  
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 2.33~3.04 2.59~3.04                  
Borrowings, maturity 2020~2022 2020~2021                  
Borrowings ₩ 55,000 ₩ 67,000                  
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 2020~2022 2020                  
Borrowings ₩ 24,000 ₩ 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+0.13~0.32 3M CD+0.24~0.32                  
Borrowings, maturity 2021~2024 2021~2022                  
Borrowings ₩ 1,150,000 ₩ 950,000                  
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 ₩ 12,466 ₩ 13,781                  
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 2020~2028 2019~2028                  
Borrowings ₩ 6,699 ₩ 8,072                  
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 ₩ 10,497 ₩ 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 ₩ 19,150 ₩ 22,096                  
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 ₩ 4,350 ₩ 5,558                  
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 2020~2024 2019~2024                  
Borrowings ₩ 2,058 ₩ 2,589                  
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 2023                  
Borrowings ₩ 1,197 ₩ 1,197                  
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 ₩ 15,696 ₩ 17,347                  
Local long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor   Shinhan Bank                  
Purpose of borrowings   Collateral borrowing                  
Borrowings interest rate   2.32                  
Borrowings, maturity   2019                  
Borrowings   ₩ 30,000                  
Local long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor Shinhan Bank Shinhan Bank                  
Purpose of borrowings Facility Facility                  
Borrowings interest rate CB rate+1.10 CB rate+1.10                  
Borrowings, maturity 2028 2028                  
Borrowings ₩ 18,698 ₩ 20,672                  
Local long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor Shinhan Bank Shinhan Bank                  
Purpose of borrowings Others Others                  
Borrowings interest rate 3.95 3.95                  
Borrowings, maturity 2035 2035                  
Borrowings ₩ 99,146 ₩ 103,851                  
Local long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor Shinhan Bank Shinhan Bank                  
Purpose of borrowings Others Others                  
Borrowings interest rate Standard overdraft rate+1.00 Standard overdraft rate +1.00                  
Borrowings, maturity 2035 2035                  
Borrowings ₩ 99,146 ₩ 103,851                  
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 ₩ 23,333 ₩ 30,333                  
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 1.75~6.80 1.75~4.60                  
Borrowings, maturity 2026~2036 2026~2036                  
Borrowings ₩ 390,044 ₩ 168,080                  
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+1.10~1.60 Standard overdraft rate+2.45 CB rate+1.10~1.20                  
Borrowings, maturity 2023~2036 2023~2036                  
Borrowings ₩ 111,834 ₩ 52,810                  
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 ₩ 29,159 ₩ 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 4.50~7.90                  
Borrowings, maturity 2022~2039 2022~2039                  
Borrowings ₩ 102,348 ₩ 102,347                  
Foreign long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Borrowings ₩ 1,345,465 ₩ 1,678,478                  
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 ₩ 10,123 ₩ 9,776 $ 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 ₩ 117,994 ₩ 138,542 101,912       123,909        
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 ₩ 239,039 ₩ 249,783   JD 146,380       JD 158,524      
Foreign long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor   Export-Import Bank of Korea and others                  
Purpose of borrowings   Commercial loan and others                  
Borrowings interest rate   3M Libor+1.50~2.50                  
Borrowings, maturity   2030~2033                  
Borrowings   ₩ 310,315         277,538        
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+2.50~2.70 6M Libor+1.70~2.50                  
Borrowings, maturity 2032 2032                  
Borrowings ₩ 137,412 ₩ 141,773 118,684       126,798        
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 Others Others                  
Borrowings interest rate 3.88 3.88                  
Borrowings, maturity 2021 2021                  
Borrowings ₩ 334,685 ₩ 310,427 289,709       278,105        
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 ₩ 15,051 ₩ 49,956 13,000       44,680        
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 ₩ 7,925 ₩ 7,647   JD 4,853       JD 4,853      
Foreign long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor   PT PJB                  
Purpose of borrowings   Shareholder's loan                  
Borrowings interest rate   12.75                  
Borrowings, maturity   2019                  
Borrowings   ₩ 428               Rp 5,569,304  
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 ₩ 52,972 ₩ 53,565     ¥ 4,981,038       ¥ 5,286,835    
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 ₩ 34,171 ₩ 34,553     ¥ 3,213,121       ¥ 3,410,381    
Foreign long-term borrowings                      
Disclosure of detailed information about Long-term borrowings [Line Items]                      
Name of Creditor   SMBC and others                  
Purpose of borrowings   Equity Bridge Loan                  
Borrowings interest rate   1M Libor+0.90                  
Borrowings, maturity   2019                  
Borrowings   ₩ 49,218         44,019        
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 ₩ 278,652 ₩ 206,944       ₨ 37,252,930         ₨ 25,900,420
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 2.39~13                  
Borrowings, maturity 2031~2038 2031~2038                  
Borrowings ₩ 117,377 ₩ 114,406 101,380       102,322        
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                  
Borrowings ₩ 64 ₩ 1,145 $ 57       $ 1,025