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Sales - Summary of Sales (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | ₩ 85,940,137 | ₩ 69,184,469 | ₩ 58,800,977
Sales related to rendering of services |  | 750,878 | 714,602 | 456,400
Sales related to construction services |  | 785,395 | 646,953 | 754,998
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 87,476,410 | 70,546,024 | 60,012,375
Domestic |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 85,588,151 | 68,578,390 | 58,359,774
Sales related to rendering of services |  | 467,661 | 370,799 | 252,216
Sales related to construction services |  | 186,996 | 193,541 | 159,262
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 86,242,808 | 69,142,730 | 58,771,252
Domestic | Electricity |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 82,954,778 | 66,198,964 | 57,308,555
Domestic | Heat Supply |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 440,435 | 489,629 | 232,738
Domestic | Others |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 2,192,938 | 1,889,797 | 818,481
Domestic | Performance obligations satisfied at point in time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 85,588,151 | 68,578,390 | 58,359,774
Domestic | Performance obligations satisfied over time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 654,657 | 564,340 | 411,478
Overseas |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 351,986 | 606,079 | 441,203
Sales related to rendering of services |  | 283,217 | 343,803 | 204,184
Sales related to construction services |  | 598,399 | 453,412 | 595,736
Total revenue from external customers (Notes 4, 35, 45, 47) | [1] | 1,233,602 | 1,403,294 | 1,241,123
Overseas | Electricity |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 0 | 0 | 0
Overseas | Heat Supply |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 0 | 0 | 0
Overseas | Others |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods (Note 2) |  | 351,986 | 606,079 | 441,203
Overseas | Performance obligations satisfied at point in time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 351,986 | 606,079 | 441,203
Overseas | Performance obligations satisfied over time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | ₩ 881,616 | ₩ 797,215 | ₩ 799,920
[1] | Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.

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