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Sales (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue [abstract] |
Summary of Sales | Details of sales for the years ended December 31, 2021, 2022 and 2023 are as follows:
|  |  |  |  | 2021 |  |  | 2022 |  |  | 2023 |
|  |  |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |
|  |  |  |  | In millions of won |
[Type of goods and services] |
Sales of goods |  | ￦ |  |  |  |  | 58,359,774 |  |  |  | 441,203 |  |  |  | 68,578,390 |  |  |  | 606,079 |  |  |  | 85,588,151 |  |  |  | 351,986 |
Electricity |  |  |  |  |  |  | 57,308,555 |  |  |  | — |  |  |  | 66,198,964 |  |  |  | — |  |  |  | 82,954,778 |  |  |  | — |
Heat supply |  |  |  |  |  |  | 232,738 |  |  |  | — |  |  |  | 489,629 |  |  |  | — |  |  |  | 440,435 |  |  |  | — |
Others |  |  |  |  |  |  | 818,481 |  |  |  | 441,203 |  |  |  | 1,889,797 |  |  |  | 606,079 |  |  |  | 2,192,938 |  |  |  | 351,986 |
Sales related to rendering of services |  |  |  |  |  |  | 252,216 |  |  |  | 204,184 |  |  |  | 370,799 |  |  |  | 343,803 |  |  |  | 467,661 |  |  |  | 283,217 |
Sales related to construction services |  |  |  |  |  |  | 159,262 |  |  |  | 595,736 |  |  |  | 193,541 |  |  |  | 453,412 |  |  |  | 186,996 |  |  |  | 598,399 |
|  | ￦ |  |  |  |  | 58,771,252 |  |  |  | 1,241,123 |  |  |  | 69,142,730 |  |  |  | 1,403,294 |  |  |  | 86,242,808 |  |  |  | 1,233,602 |
[Timing of revenue recognition] |
Performance obligations satisfied at a point in time |  | ￦ |  |  |  |  | 58,359,774 |  |  |  | 441,203 |  |  |  | 68,578,390 |  |  |  | 606,079 |  |  |  | 85,588,151 |  |  |  | 351,986 |
Performance obligations satisfied over time |  |  |  |  |  |  | 411,478 |  |  |  | 799,920 |  |  |  | 564,340 |  |  |  | 797,215 |  |  |  | 654,657 |  |  |  | 881,616 |
|  | ￦ |  |  |  |  | 58,771,252 |  |  |  | 1,241,123 |  |  |  | 69,142,730 |  |  |  | 1,403,294 |  |  |  | 86,242,808 |  |  |  | 1,233,602 |

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