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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, 2019 KRW (₩) | Dec. 31, 2018 KRW (₩) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 AUD ($) | Dec. 31, 2019 CHF (SFr) | Dec. 31, 2019 HKD ($) | Dec. 31, 2019 SEK (kr) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 AUD ($) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 HKD ($) | Dec. 31, 2018 SEK (kr)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 63,261,668 | ₩ 56,695,855 |  |  |  |  |  |  |  |  |  |  |  |
Less : Discount on debt securities |  | (91,700) | (91,887) |  |  |  |  |  |  |  |  |  |  |  |
Add : Premium on debt securities |  | 1,696 | 20 |  |  |  |  |  |  |  |  |  |  |  |
Less : Current portion of debt securities |  | (7,545,485) | (6,790,778) |  |  |  |  |  |  |  |  |  |  |  |
Add : Current portion of discount on debt securities |  | 2,780 | 1,974 |  |  |  |  |  |  |  |  |  |  |  |
Less: Current portion of premium on foreign debt securities |  | 0 | (20) |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 55,628,959 | 49,815,164 |  |  |  |  |  |  |  |  |  |  |  |
Local Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | 52,913,577 | 47,703,228 |  |  |  |  |  |  |  |  |  |  |  |
Less : Discount on debt securities |  | (42,274) | (41,247) |  |  |  |  |  |  |  |  |  |  |  |
Less : Current portion of debt securities |  | (6,340,000) | (5,330,000) |  |  |  |  |  |  |  |  |  |  |  |
Add : Current portion of discount on debt securities |  | 1,409 | 1,035 |  |  |  |  |  |  |  |  |  |  |  |
Total |  | ₩ 46,532,712 | ₩ 42,333,016 |  |  |  |  |  |  |  |  |  |  |  |
Electricity Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2010.04.08~ 2019.12.30 | 2009.12.03~ 2018.12.04 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2020.01.12~ 2049.10.24 | 2019.01.08~ 2048.10.29 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 1.32~5.26 | 1.62~5.45 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 28,450,000 | ₩ 24,480,000 |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date | [1] | 2009.10.16~ 2019.12.19 | 2009.05.04~ 2018.11.09 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description | [1] | 2020.02.22~ 2049.12.19 | 2019.01.21~2048.11.09 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) | [1] | 1.29~6.00 | 1.36~6.00 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | [1] | ₩ 24,463,577 | ₩ 23,223,228 |  |  |  |  |  |  |  |  |  |  |  |
Foreign Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | 10,348,091 | 8,992,627 |  |  |  |  |  |  |  |  |  |  |  |
Less : Discount on debt securities |  | (49,426) | (50,640) |  |  |  |  |  |  |  |  |  |  |  |
Add : Premium on debt securities |  | 1,696 | 20 |  |  |  |  |  |  |  |  |  |  |  |
Less : Current portion of debt securities |  | (1,205,485) | (1,460,778) |  |  |  |  |  |  |  |  |  |  |  |
Add : Current portion of discount on debt securities |  | 1,371 | 939 |  |  |  |  |  |  |  |  |  |  |  |
Less: Current portion of premium on foreign debt securities |  | 0 | (20) |  |  |  |  |  |  |  |  |  |  |  |
Total |  | ₩ 9,096,247 | ₩ 7,482,148 |  |  |  |  |  |  |  |  |  |  |  |
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 | 6.00~8.37 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 288,379 | ₩ 278,488 | $ 249,074 |  |  |  |  |  | $ 249,071 |  |  |  |  |
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 |  | ₩ 364,379 | ₩ 351,885 | 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 |  | ₩ 332,196 | ₩ 320,805 | 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 |  | ₩ 578,900 | ₩ 559,050 | 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 | 3 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 868,350 | ₩ 838,575 | 750,000 |  |  |  |  |  | 750,000 |  |  |  |  |
FY-13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  |  | 2013.09.26~2013.10.23 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2019.03.26~2019.04.23 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  |  | 1.50~1.63 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  | ₩ 454,488 |  |  |  |  |  |  |  |  |  | SFr 400,000 |  |
FY-13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2013.09.25 | 2013.09.25 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2020.09.25 | 2020.09.25 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 5.75 | 5.75 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 263,361 | ₩ 256,038 |  |  | $ 325,000 |  |  |  |  |  | $ 325,000 |  |  |
FY-14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2014.07.30~2014.12.02 | 2014.02.11~2014.12.02 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2020.06.02~2029.07.30 | 2019.02.11~2029.07.30 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.50~3.57 | 2.38~3.57 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 694,680 | ₩ 1,677,150 | 600,000 |  |  |  |  |  | 1,500,000 |  |  |  |  |
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 |  | ₩ 347,340 | ₩ 335,430 | 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 |  | ₩ 347,340 | ₩ 335,430 | 300,000 |  |  |  |  |  | 300,000 |  |  |  |  |
FY-17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2017.04.12~2017.07.25 | 2017.04.12~2017.07.25 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2020.04.12~2027.07.25 | 2020.04.12~2027.07.25 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.38~3.13 | 2.38~3.13 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 1,273,580 | ₩ 1,229,910 | 1,100,000 |  |  |  |  |  | 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 |  | ₩ 51,897 | ₩ 51,166 |  | € 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 |  | ₩ 55,737 | ₩ 56,061 |  |  |  |  |  | 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 |  | ₩ 2,084,040 | ₩ 2,012,580 | 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 |  | ₩ 245,289 | ₩ 235,571 |  |  |  |  | $ 1,650,000 |  |  |  |  |  | $ 1,650,000 |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.01.22~2019.06.24 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2022.01.22~2024.06.24 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.50~3.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 926,240 |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.02.27 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2024.02.27 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 239,104 |  |  |  |  | SFr 200,000 |  |  |  |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.07.19 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2024.07.19~2027.07.19 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 0~0.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 358,656 |  |  |  |  | SFr 300,000 |  |  |  |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.07.22 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2022.07.22 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 2.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 347,340 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.10.31 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2024.10.30 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3M BBSW+97bp |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 243,102 |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
FY-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  | 2019.12.19 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  | 2037.12.31 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (%) |  | 3.3~5.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  | ₩ 438,181 |  | $ 378,460 |  |  |  |  |  |  |  |  |  |  |
[1] | Corporate bonds of HeeMang Sunlight Power Co., Ltd. amounting to KRW2,697 million can be redeemed every March 31 after five years from its issue date, March 31, 2016.

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