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Sales (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue [Abstract] |
Sales | Details of sales for the years ended December 31, 2018, 2019 and 2020 are as follows:
|  |  |  |  | 2018 |  |  | 2019 |  |  | 2020 |
|  |  |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |
|  |  |  |  | In millions of won |
[Type of goods and services] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of goods |  | ￦ |  |  |  |  | 57,514,866 |  |  |  | 382,938 |  |  |  | 56,609,330 |  |  |  | 285,546 |  |  |  | 56,380,608 |  |  |  | 303,704 |
Electricity |  |  |  |  |  |  | 56,842,011 |  |  |  | — |  |  |  | 55,939,001 |  |  |  | — |  |  |  | 55,730,985 |  |  |  | — |
Heat supply |  |  |  |  |  |  | 216,117 |  |  |  | — |  |  |  | 220,948 |  |  |  | — |  |  |  | 198,715 |  |  |  | — |
Others |  |  |  |  |  |  | 456,738 |  |  |  | 382,938 |  |  |  | 449,381 |  |  |  | 285,546 |  |  |  | 450,908 |  |  |  | 303,704 |
Sales related to rendering of services |  |  |  |  |  |  | 176,539 |  |  |  | 216,328 |  |  |  | 222,106 |  |  |  | 186,184 |  |  |  | 223,075 |  |  |  | 206,275 |
Sales of construction services |  |  |  |  |  |  | 108,586 |  |  |  | 1,633,805 |  |  |  | 110,692 |  |  |  | 1,154,224 |  |  |  | 170,895 |  |  |  | 641,280 |
|  | ￦ |  |  |  |  | 57,799,991 |  |  |  | 2,233,071 |  |  |  | 56,942,128 |  |  |  | 1,625,954 |  |  |  | 56,774,578 |  |  |  | 1,151,259 |
[Timing of revenue recognition] |
Performance obligations satisfied at a point in time |  | ￦ |  |  |  |  | 57,514,866 |  |  |  | 382,938 |  |  |  | 56,609,330 |  |  |  | 285,546 |  |  |  | 56,380,608 |  |  |  | 303,704 |
Performance obligations satisfied over time |  |  |  |  |  |  | 285,125 |  |  |  | 1,850,133 |  |  |  | 332,798 |  |  |  | 1,340,408 |  |  |  | 393,970 |  |  |  | 847,555 |
|  | ￦ |  |  |  |  | 57,799,991 |  |  |  | 2,233,071 |  |  |  | 56,942,128 |  |  |  | 1,625,954 |  |  |  | 56,774,578 |  |  |  | 1,151,259 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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