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Borrowings and Debt Securities : Local debt securities and Foreign debt securities (Details) € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 KRW (₩) | Dec. 31, 2019 KRW (₩) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 HKD ($) | Dec. 31, 2020 CHF (SFr) | Dec. 31, 2020 AUD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 SEK (kr) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 HKD ($) | Dec. 31, 2019 CHF (SFr) | Dec. 31, 2019 AUD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 SEK (kr)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 64,753,535 | ₩ 63,261,668 |  |  |  |  |  |  |  |  |  |  |  |
Less : Discount on debt securities |  | (147,500) | (91,700) |  |  |  |  |  |  |  |  |  |  |  |
Add : Premium on debt securities |  | 1,366 | 1,696 |  |  |  |  |  |  |  |  |  |  |  |
Less : Current portion of debt securities |  | (8,565,301) | (7,545,485) |  |  |  |  |  |  |  |  |  |  |  |
Add : Current portion of discount on debt securities |  | 3,677 | 2,780 |  |  |  |  |  |  |  |  |  |  |  |
Less: Current portion of premium on foreign debt securities |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 56,045,777 | 55,628,959 |  |  |  |  |  |  |  |  |  |  |  |
Local Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | 54,273,577 | 52,913,577 |  |  |  |  |  |  |  |  |  |  |  |
Less : Discount on debt securities |  | (46,730) | (42,274) |  |  |  |  |  |  |  |  |  |  |  |
Less : Current portion of debt securities |  | (7,243,217) | (6,340,000) |  |  |  |  |  |  |  |  |  |  |  |
Add : Current portion of discount on debt securities |  | 2,108 | 1,409 |  |  |  |  |  |  |  |  |  |  |  |
Total |  | ₩ 46,985,738 | ₩ 46,532,712 |  |  |  |  |  |  |  |  |  |  |  |
Electricity Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2011.05.06 ~2020.11.04 | 2011.05.06 ~2020.11.04 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2021.02.08 ~2049.10.24 | 2021.02.08 ~2049.10.24 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 1.02~4.58 | 1.02~4.58 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 27,810,000 | ₩ 28,450,000 |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2009.10.16 ~2020.12.22 | 2009.10.16 ~2020.12.22 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2021.01.11 ~2050.12.22 | 2021.01.11 ~2050.12.22 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 1.00~6.00 | 1.00~6.00 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | [1] | ₩ 26,463,577 | ₩ 24,463,577 |  |  |  |  |  |  |  |  |  |  |  |
Foreign Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | 10,479,958 | 10,348,091 |  |  |  |  |  |  |  |  |  |  |  |
Less : Discount on debt securities |  | (100,770) | (49,426) |  |  |  |  |  |  |  |  |  |  |  |
Add : Premium on debt securities |  | 1,366 | 1,696 |  |  |  |  |  |  |  |  |  |  |  |
Less : Current portion of debt securities |  | (1,322,084) | (1,205,485) |  |  |  |  |  |  |  |  |  |  |  |
Add : Current portion of discount on debt securities |  | 1,569 | 1,371 |  |  |  |  |  |  |  |  |  |  |  |
Less: Current portion of premium on foreign debt securities |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Total |  | ₩ 9,060,039 | ₩ 9,096,247 |  |  |  |  |  |  |  |  |  |  |  |
FY-96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 1996.04.01~1996.12.06 | 1996.04.01~1996.12.06 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2026.12.01~2096.04.01 | 2026.12.01~2096.04.01 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 6.00~7.95 | 6.00~7.95 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 303,227 | ₩ 288,379 | $ 278,701 |  |  |  |  |  | $ 249,074 |  |  |  |  |
FY-97 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 1997.01.31~1997.08.04 | 1997.01.31~1997.08.04 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2027.02.01~2027.08.01 | 2027.02.01~2027.08.01 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 6.75~7.00 | 6.75~7.00 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 342,412 | ₩ 364,379 | 314,717 |  |  |  |  |  | 314,717 |  |  |  |  |
FY-04 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2004.04.23 | 2004.04.23 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2034.04.23 | 2034.04.23 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 5.13 | 5.13 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 312,169 | ₩ 332,196 | 286,920 |  |  |  |  |  | 286,920 |  |  |  |  |
FY-11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2011.07.13 | 2011.07.13 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2021.07.13 | 2021.07.13 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 4.75 | 4.75 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 544,000 | ₩ 578,900 | 500,000 |  |  |  |  |  | 500,000 |  |  |  |  |
FY-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2012.09.19 | 2012.09.19 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2022.09.19 | 2022.09.19 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.00 | 3.00 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 816,000 | ₩ 868,350 | 750,000 |  |  |  |  |  | 750,000 |  |  |  |  |
FY-13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  |  | 2013.09.25 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2020.09.25 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  |  | 5.75 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  | ₩ 263,361 |  |  |  |  |  |  |  |  |  | $ 325,000 |  |
FY-14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2014.07.30 | 2014.07.30~2014.12.02 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2029.07.30 | 2020.06.02~2029.07.30 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.57 | 2.50~3.57 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 108,800 | ₩ 694,680 | 100,000 |  |  |  |  |  | 600,000 |  |  |  |  |
FY-15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2015.06.15 | 2015.06.15 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2025.06.15 | 2025.06.15 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.25 | 3.25 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 326,400 | ₩ 347,340 | 300,000 |  |  |  |  |  | 300,000 |  |  |  |  |
FY-16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2016.01.21 | 2016.01.21 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2021.07.21 | 2021.07.21 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.50 | 2.50 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 326,400 | ₩ 347,340 | 300,000 |  |  |  |  |  | 300,000 |  |  |  |  |
FY-17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2017.06.19~2017.07.25 | 2017.04.12~2017.07.25 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2022.06.19~2027.07.25 | 2020.04.12~2027.07.25 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.63~3.13 | 2.38~3.13 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 870,400 | ₩ 1,273,580 | 800,000 |  |  |  |  |  | 1,100,000 |  |  |  |  |
FY-17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2017.10.30 | 2017.10.30 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2037.10.30 | 2037.10.30 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 1.70 | 1.70 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 53,530 | ₩ 51,897 |  |  |  |  | € 40,000 |  |  |  |  |  | € 40,000 |
FY-17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2017.11.16 | 2017.11.16 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2037.11.16 | 2037.11.16 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.36 | 2.36 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 59,747 | ₩ 55,737 |  |  |  |  |  | kr 450,000 |  |  |  |  |  | kr 450,000
FY-18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2018.01.29~2018.07.25 | 2018.01.29~2018.07.25 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2021.01.29~2023.07.25 | 2021.01.29~2023.07.25 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.00~3.88 | 3.00~3.88 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 1,958,400 | ₩ 2,084,040 | 1,800,000 |  |  |  |  |  | 1,800,000 |  |  |  |  |
FY-18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2018.03.13 | 2018.03.13 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2028.03.13 | 2028.03.13 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.35 | 3.35 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 231,578 | ₩ 245,289 |  | $ 1,650,000 |  |  |  |  |  | $ 1,650,000 |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.01.22~2019.06.24 | 2019.01.22~2019.06.24 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2022.01.22~2024.06.24 | 2022.01.22~2024.06.24 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.50~3.38 | 2.50~3.38 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 870,400 | ₩ 926,240 | 800,000 |  |  |  |  |  | 800,000 |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.02.27 | 2019.02.27 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2024.02.27 | 2024.02.27 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 0.13 | 0.13 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 246,866 | ₩ 239,104 |  |  | SFr 200,000 |  |  |  |  |  | SFr 200,000 |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.07.19 | 2019.07.19 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2024.07.19~2027.07.19 | 2024.07.19~2027.07.19 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 0.00~0.05 | 0.00~0.05 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 370,299 | ₩ 358,656 |  |  | SFr 300,000 |  |  |  |  |  | SFr 300,000 |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.07.22 | 2019.07.22 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2022.07.22 | 2022.07.22 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.38 | 2.38 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 326,400 | ₩ 347,340 | 300,000 |  |  |  |  |  | 300,000 |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.10.30 | 2019.10.30 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2024.10.30 | 2024.10.30 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3M BBSW+0.97 | 3M BBSW+0.97 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 250,968 | ₩ 243,102 |  |  |  | $ 300,000 |  |  |  |  |  | $ 300,000 |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.12.19 | 2019.12.19 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2037.12.31 | 2037.12.31 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.30~5.70 | 3.30~5.70 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 421,163 | ₩ 438,181 | 387,098 |  |  |  |  |  | $ 378,460 |  |  |  |  |
FY-20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2020.02.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2025.02.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.13 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 326,400 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
FY-20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2020.06.15 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2025.06.15 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 1.13 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 544,000 |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
FY-20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2020.05.06 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2025.05.06 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 1.75 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 544,000 |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
FY-20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2020.08.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2026.02.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 0.61 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 326,399 |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
[1] | Among the corporate bonds, each holder of Hee mang sunlight Power Co., Ltd.'s private equity bonds, amounting to KRW2,697 million, may exercise the right of early redemption on the 5th year (March 31, 2021) from the date of issuance of the bond and every year on March 31 thereafter, until the year before the redemption date.

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