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Sales (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue [abstract] |
Summary of Sales | Details of sales for the years ended December 31, 2022, 2023 and 2024 are as follows:
|  |  |  |  | 2022 |  |  | 2023 |  |  | 2024 |
|  |  |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |
|  |  |  |  | In millions of won |
[Type of goods and services] |
Sales of goods |  | ￦ |  |  |  |  | 68,578,390 |  |  |  | 606,079 |  |  |  | 85,588,151 |  |  |  | 351,986 |  |  |  | 90,659,090 |  |  |  | 359,622 |
Electricity |  |  |  |  |  |  | 66,198,964 |  |  |  | — |  |  |  | 82,954,778 |  |  |  | — |  |  |  | 88,889,764 |  |  |  | — |
Heat supply |  |  |  |  |  |  | 489,629 |  |  |  | — |  |  |  | 440,435 |  |  |  | — |  |  |  | 363,154 |  |  |  | — |
Others |  |  |  |  |  |  | 1,889,797 |  |  |  | 606,079 |  |  |  | 2,192,938 |  |  |  | 351,986 |  |  |  | 1,406,172 |  |  |  | 359,622 |
Sales related to rendering of services |  |  |  |  |  |  | 370,799 |  |  |  | 343,803 |  |  |  | 467,661 |  |  |  | 283,217 |  |  |  | 482,251 |  |  |  | 228,194 |
Sales related to construction services |  |  |  |  |  |  | 193,541 |  |  |  | 453,412 |  |  |  | 186,996 |  |  |  | 598,399 |  |  |  | 145,496 |  |  |  | 703,612 |
|  | ￦ |  |  |  |  | 69,142,730 |  |  |  | 1,403,294 |  |  |  | 86,242,808 |  |  |  | 1,233,602 |  |  |  | 91,286,837 |  |  |  | 1,291,428 |
[Timing of revenue recognition] |
Performance obligations satisfied at a point in time |  | ￦ |  |  |  |  | 68,578,390 |  |  |  | 606,079 |  |  |  | 85,588,151 |  |  |  | 351,986 |  |  |  | 90,659,090 |  |  |  | 359,622 |
Performance obligations satisfied over time |  |  |  |  |  |  | 564,340 |  |  |  | 797,215 |  |  |  | 654,657 |  |  |  | 881,616 |  |  |  | 627,747 |  |  |  | 931,806 |
|  | ￦ |  |  |  |  | 69,142,730 |  |  |  | 1,403,294 |  |  |  | 86,242,808 |  |  |  | 1,233,602 |  |  |  | 91,286,837 |  |  |  | 1,291,428 |

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